Unassociated Document

		BEAR, STEARNS & CO. INC.
ATLANTA • BOSTON • CHICAGO		ASSET-BACKED SECURITIES GROUP
DALLAS • LOS ANGELES • NEW YORK • SAN FRANCISCO		383 Madison Avenue
FRANKFURT • GENEVA • HONG KONG		New York, N.Y. 10179
LONDON • PARIS • TOKYO		(212) 272-2000

Part I of II

New Issue Computational Materials

$[1,400,003,000] (Approximate)

Impac Secured Assets Corp.,

Pass-Through Certificates, Series 2007-2

Impac Funding Corporation

Seller and Master Servicer

Impac Secured Assets Corp.

Depositor

Ambac Assurance Corporation

Certificate Insurer

March 20, 2007 (Revised March 26, 2007)

This information should be considered only after reading Bear Stearns’ statement regarding Securities, Pricing Estimates and Other Information (the “Statement”), which should be attached. Do not use or rely on this information if you have not received and reviewed this Statement. You may obtain a copy of the Statement from your sales representative.

		BEAR, STEARNS & CO. INC.
ATLANTA • BOSTON • CHICAGO		ASSET-BACKED SECURITIES GROUP
DALLAS • LOS ANGELES • NEW YORK • SAN FRANCISCO		383 Madison Avenue
FRANKFURT • GENEVA • HONG KONG		New York, N.Y. 10179
LONDON • PARIS • TOKYO		(212) 272-2000

STATEMENT REGARDING FREE WRITING PROSPECTUS

The issuer has filed a registration statement (File No. 333-131328) (including a prospectus) with the SEC for the offering to which this free writing prospectus relates. Before you invest, you should read the prospectus in the registration statement and other documents the depositor has filed with the SEC for more complete information about the depositor, the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the depositor, any underwriter or any dealer participating in the offering will arrange to send you the prospectus you request it by calling toll free 1-866-803-9204.

This free writing prospectus does not contain all information that is required to be included in the base prospectus and the prospectus supplement.

The Information in this free writing prospectus is preliminary and is subject to completion or change.

The Information in this free writing prospectus supersedes information contained in any prior similar free writing prospectus relating to these securities prior to the time of your commitment to purchase.

This free writing prospectus is not an offer to sell or solicitation of an offer to buy these securities in any state where such offer, solicitation or sale is not permitted.

The information in this free writing prospectus is preliminary, and will be superseded by the definitive free writing prospectus. This free writing prospectus is being delivered to you solely to provide you with information about the offering of the asset-backed securities referred to in this free writing prospectus and to solicit an indication of your interest in purchasing such securities, when, as and if issued. Any such indication of interest will not constitute a contractual commitment by you to purchase any of the securities. You may withdraw your indication of interest at any time.

The securities referred to in this free writing prospectus are being offered when, as and if issued. Our obligation to sell securities to you is conditioned on the securities having the characteristics described in this free writing prospectus. If that condition is not satisfied, we will notify you, and neither the issuer nor any underwriter will have any obligation to you to deliver all or any portion of the securities which you have committed to purchase, and there will be no liability between us as a consequence of the non-delivery.

		BEAR, STEARNS & CO. INC.
ATLANTA • BOSTON • CHICAGO		ASSET-BACKED SECURITIES GROUP
DALLAS • LOS ANGELES • NEW YORK • SAN FRANCISCO		383 Madison Avenue
FRANKFURT • GENEVA • HONG KONG		New York, N.Y. 10179
LONDON • PARIS • TOKYO		(212) 272-2000

SECURITIES, PRICING ESTIMATES AND OTHER INFORMATION

The information contained in the attached materials (the “Information”) may include various forms of performance analysis, security characteristics and securities pricing estimates for the securities described therein. Should you receive Information that refers to the “Statement Regarding Assumptions and Other Information”, please refer to this statement instead. The Information is illustrative and is not intended to predict actual results which may differ substantially from those reflected in the Information. Performance analysis is based on certain assumptions with respect to significant factors that may prove not to be as assumed. Performance results are based on mathematical models that use inputs to calculate results. As with all models, results may vary significantly depending upon the value given to the inputs. Inputs to these models include but are not limited to: prepayment expectations (econometric prepayment models, single expected lifetime prepayments or a vector of periodic prepayments), interest rate assumptions (parallel and nonparallel changes for different maturity instruments), collateral assumptions (actual pool level data, aggregated pool level data, reported factors or imputed factors), volatility assumptions (historically observed or implied current) and reported information (paydown factors, rate resets, remittance reports and trustee statements). Models used in any analysis may be proprietary, the results therefore, may be difficult for any third party to reproduce. Contact your registered representative for detailed explanations of any modeling techniques employed in the Information.

The Information may not reflect the impact of all structural characteristics of the security, including call events and cash flow priorities at all prepayment speeds and/or interest rates. You should consider whether the behavior of these securities should be tested using assumptions different from those included in the Information. The assumptions underlying the Information, including structure and collateral, may be modified from time to time to reflect changed facts and circumstances. Offering Documents contain data that is current as of their publication dates and after publication may no longer be accurate, complete or current. Contact your registered representative for Offering Documents, current Information or additional materials, including other models for performance analysis, which are likely to produce different results, and any further explanation regarding the Information.

Any pricing estimates Bear Stearns has supplied at your request (a) represent our view, at the time determined, of the investment value of the securities between the estimated bid and offer levels, the spread between which may be significant due to market volatility or illiquidity, (b) do not constitute a bid by Bear Stearns or any other person for any security, (c) may not constitute prices at which the securities could have been purchased or sold in any market at any time, (d) have not been confirmed by actual trades, may vary from the value Bear Stearns assigns or may be assigned to any such security while in its inventory, and may not take into account the size of a position you have in the security, and (e) may have been derived from matrix pricing that uses data relating to other securities whose prices are more readily ascertainable to produce a hypothetical price based on the estimated yield spread relationship between the securities.

General Information: Bear Stearns and/or individuals associated therewith may have positions in these securities while the Information is circulating or during such period may engage in transactions with the issuer or its affiliates. We act as principal in transactions with you, and accordingly, you must determine the appropriateness for you of such transactions and address any legal, tax or accounting considerations applicable to you. Bear Stearns shall not be a fiduciary or advisor unless we have agreed in writing to receive compensation specifically to act in such capacities. If you are subject to ERISA, the Information is being furnished on the condition that it will not form a primary basis for any investment decision.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 1 of 46

$[1,400,003,000] (Approximate)

Characteristics of the Certificates (1) (2) (3)

Class	Original Principal Balance	Coupon	Tranche Type	WAL to call (years)	Principal Window (mos.)	Last Scheduled Payment Date	Expected Ratings (S&P/Mdy’s)
1-A1-A	$338,964,000	(4)(5)	Super Senior Sequential	1.00	1 - 21	5/25/2037	AAA/Aaa
1-A1-B	$368,075,000	(4)(5)	Super Senior Sequential	3.00	21 - 59	5/25/2037	AAA/Aaa
1-A1-C	$182,587,000	(4)(5)	Super Senior Sequential	5.99	59 - 79	5/25/2037	AAA/Aaa
1-AM	222,406,000	(4)(5)(7)	Insured/ Support Senior	2.85	1 - 79	5/25/2037	AAA/Aaa
1-M-1	16,134,000	(4)(5)	Mezzanine	4.69	37 - 79	5/25/2037	AA+/Aa1
1-M-2	14,341,000	(4)(5)	Mezzanine	4.68	37 - 79	5/25/2037	AA/Aa2
1-M-3	7,768,000	(4)(5)	Mezzanine	4.68	37 - 79	5/25/2037	AA-/Aa3
1-M-4	7,171,000	(4)(5)	Mezzanine	4.68	37 - 79	5/25/2037	A+/A1
1-M-5	5,975,000	(4)(5)	Mezzanine	4.68	37 - 79	5/25/2037	A/A2
1-M-6	4,780,000	(4)(5)	Mezzanine	4.66	37 - 79	5/25/2037	A-/A3
1-M-7	4,183,000	(4)(5)	Mezzanine	4.56	37 - 75	5/25/2037	BBB+Baa1
1-M-8	4,183,000	(4)(5)	Mezzanine	4.44	37 - 69	5/25/2037	BBB/Baa2
1-B (6)	4,780,000	(4)(5)	Subordinate			5/25/2037

2-A	$223,436,000	(4)(5)(7)	Insured Senior	5.03	1-129	4/25/2037	AAA/Aaa
Total Offered Certificates	$1,400,003,000

Notes:

(1)

The (i) Class 1-A1-A, Class 1-A1-B, Class 1-A1-C, Class 1-AM and Class 2-A Certificates (collectively, the “Class A Certificates”) and (ii) Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7 and Class 1-M-8 Certificates (collectively, the “Class 1-M Certificates”) and (iii) and the Class 1-B Certificates (the “Class 1-B Certificates” and, together with the Class 1-M Certificates, the “Subordinate Certificates”). The Class A Certificates and the Subordinate Certificates (other than the Class 1-B Certificates) are collectively referred to herein as the “Offered Certificates.”

(2)

The Certificates are subject to a +/-5% variance.

(3)

Based on the collateral prepayment assumptions described under “Pricing Prepayment Speed” herein, and priced to call.

(4)

The Pass-Through Rate for each Class of Certificates will be equal to the least of (a) one-month LIBOR plus the margin for such Class, (b) 11.50% per annum and (c) the applicable Net WAC Rate.

(5)

The Offered Certificates will be priced to call. In the event that the related optional clean-up call does not occur on the earliest possible date, (i) the margin for each of the Class A Certificates will increase to 2x the original margins and (ii) the margin for each of the Subordinate Certificates will increase to 1.5x the original margins.

(6)

The Class 1-B Certificates are not offered hereby.

(7)

The Class 1-AM Certificates and the Class 2-A Certificates benefit from a certificate guaranty insurance policy issued by the Certificate Insurer. The certificate guaranty insurance policy will unconditionally and irrevocably guarantee certain payments on the Class 1-AM Certificates and Class 2-A Certificates.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 2 of 46

Trust:		Mortgage Pass-Through Certificates, Series 2007-2.

Depositor:		Impac Secured Assets Corp.

Seller:		Impac Funding Corporation.

Master Servicer:		Impac Funding Corporation.

Sub-Servicers:		Countrywide Home Loans Servicing LP will act as the sub-servicer with respect to substantially all of the Group 1 Mortgage Loans.

		Midland Loan Services, Inc. will sub-service the Group 2 Mortgage Loans.

Lead Manager:		Bear, Stearns & Co. Inc.

Group 1 Co-Managers:		Deutsche Bank Securities Inc. and
		Countrywide Securities Corporation

Group 2 Co-Managers:		Deutsche Bank Securities Inc. and
		Merrill Lynch & Co.

Trustee:		Deutsche Bank National Trust Company.

Class 1-AM and Class 2-A Certificate Insurer:		Ambac Assurance Corporation, a Wisconsin domiciled stock insurance corporation.

Certificate Insurance Policy:		The certificate guaranty insurance policy issued by the Certificate Insurer for the benefit of the holders of the Class 1-AM and Class 2-A Certificates.

Swap Provider:		[________________]. The Swap Provider will be rated at least “A” by Standard and Poor’s and at least “A2” by Moody’s Investors Service.

Yield Maintenance Provider(s):		[________________]. The Yield Maintenance Provider(s) will be rated at least “A” by Standard and Poor’s and at least “A2” by Moody’s Investors Service.

Supplemental Interest Trust Trustee:		[Deutsche Bank National Trust Company].

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 3 of 46

Offered Certificates:		The (i) Class 1-A1-A, Class 1-A1-B, Class 1-A1-C Certificates (collectively, the “Class 1-A1 Certificates”), Class 1-AM Certificates (the “Class 1-AM Certificates” and collectively with the 1-A1 Certificates, the “Class 1-A Certificates”), (ii) Class 2-A Certificates (the “Class 2-A Certificates” and together with the Class 1-A Certificates, the “Class A Certificates”), (iii) Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7 and Class 1-M-8 Certificates (collectively, the “Class 1-M Certificates”) and (iv) Class 1-B Certificates (the “Class 1-B Certificates”, together with the “Class 1-M Certificates”, the “Subordinate Certificates”). The Class A Certificates and the Subordinate Certificates (other than the Class 1-B Certificates) are collectively referred to herein as the “Offered Certificates.”

Non-Offered Certificates:		The “Non-Offered Certificates” consist of the Class 1-B, Class 1-C, Class 1-P, Class 2-C, Class 2-P and Class R Certificates. The Offered Certificates and the Non-Offered Certificates are collectively referred to herein as the “Certificates.”

Registration:		Book-Entry form, same day funds through DTC, Clearstream and Euroclear.

Tax Status:		It is anticipated that the Offered Certificates will represent ownership of REMIC regular interests for tax purposes.

ERISA Eligibility:		The Offered Certificates are expected to be eligible for purchase by employee benefit plans and similar plans and arrangements that are subject to Title I of ERISA or Section 4975 of the Internal Revenue Code of 1986, as amended, that qualify under an investor-based prohibited transaction class exemption, as described in the prospectus.

SMMEA Treatment:		The Offered Certificates (other than the Class 2-A Certificates) will not constitute “mortgage related securities” for the purposes of SMMEA. The Class 2-A Certificates are expected to constitute “mortgage related securities” for the purpose of SMMEA.

Sample Pool Calculation Date:		March 1, 2007.

Cut-off Date:		For each Mortgage Loan delivered to the Trust on the Closing Date, the later of March 1, 2007 or the origination date of such Mortgage Loan. The Trust will be entitled to all payments due after March 1, 2007.

Expected Pricing Date:		March [27], 2007.

Expected Closing Date:		March [29], 2007.

Distribution Date:		The 25th day of each month (or, if such day is not a business day, the next succeeding business day) commencing in April 2007.

Accrued Interest:		The Certificates will settle flat.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 4 of 46

Interest Accrual Period:		The “Interest Accrual Period” for each Distribution Date with respect to the Certificates will be the period beginning with the previous Distribution Date (or, in the case of the first Distribution Date, the Closing Date) and ending on the day prior to such Distribution Date (on an actual/360 day basis).

Group 1 Optional Call:		The terms of the transaction allow for a clean-up call (the “Group 1 Clean-up Call”), which may be exercised on the distribution date the aggregate stated principal balance of the Group 1 Mortgage Loans has been reduced to less than or equal to 10% of the aggregate stated principal balance of the Group 1 Mortgage Loans as of the Cut-off Date.

Group 2 Optional Call:		The terms of the transaction allow for a clean-up call (the “Group 2 Clean-up Call”), which may be exercised on the distribution date the aggregate stated principal balance of the Group 2 Mortgage Loans has been reduced to less than or equal to 10% of the aggregate stated principal balance of the Group 2 Mortgage Loans as of the Cut-off Date.

Pricing Prepayment Speed:		The Offered Certificates will be priced based on the following collateral prepayment assumptions:

		Group 1 Prepayment Speed:

Fixed Rate Mortgage Loans

100% PPC, which assumes 23% HEP (i.e., prepayments start at 2.3% CPR in month 1, and increase by 2.3% CPR each month to 23% CPR in month 10, and remain constant at 23% CPR thereafter).

Adjustable Rate and 2 Year Fixed/28 Year Adjustable Rate Mortgage Loans

100% PPC, which assumes 2% CPR in month 1, an additional 1/11th of 28% CPR (rounded to the nearest hundredth) for each month thereafter, building to 30% CPR in month 12 and remaining constant at 30% CPR until month 24, increasing to and remaining constant at 65% CPR from month 25 until month 31, decreasing 1/4th of 30% CPR for each month thereafter, decreasing to 35% CPR in month 35 and remaining constant at 35% CPR from month 35 and thereafter.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 5 of 46

3 Year Fixed/27 Year Adjustable Rate Hybrid Mortgage Loans

100% PPC, which assumes 2% CPR in month 1, an additional 1/11th of 28% CPR for each month thereafter, building to 30% CPR in month 12 and remaining constant at 30% CPR until month 36, increasing to and remaining constant at 65% CPR from month 37 until month 43, decreasing 1/4th of 30% CPR for each month thereafter, decreasing to 35% CPR in month 47 and remaining constant at 35% CPR from month 47 and thereafter.

5, 7 & 10 Year Fixed/25, 23 & 20 Year Adjustable Rate Mortgage Loans

100% PPC, which assumes 2% CPR in month 1, an additional 1/11th of 28% CPR for each month thereafter, building to 30% CPR in month 12 and remaining constant at 30% CPR until month 60, increasing to and remaining constant at 65% CPR from month 61 until month 67, decreasing 1/4th of 30% CPR for each month thereafter, decreasing to 35% CPR in month 71 and remaining constant at 35% CPR from month 71 and thereafter.

Group 2 Prepayment Speed:

100% PPC, which assumes 0% CPR in the first month after the origination date of such mortgage loan, an additional 1/11th of 5% CPR for each month thereafter, building to 5% CPR in the first 12 month period, an additional 1/12th of 15% CPR for each month thereafter, building to 20% CPR in the next 12 month period and remaining at 20% CPR thereafter; provided, however, that with respect to approximately $46,841,776 of the Group 2 Mortgage Loans, the prepayment vector will assume 0% CPR for months one through sixty, and 30% CPR in month 61 and thereafter.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 6 of 46

Mortgage Loans:		The Trust will consist of (a) fixed-rate and adjustable-rate mortgage loans secured by first and second liens on the related mortgaged properties with an aggregate principal balance as of the sample pool calculation date (the “Sample Pool Calculation Date Balance”) of approximately $[1,195,091,190] (the “Group 1 Mortgage Loans”), and (b) fixed-rate and adjustable-rate mortgage loans secured by first liens on multifamily and commercial properties with an aggregate principal balance as of the Sample Pool Calculation Date of approximately $[234,949,001] (the “Group 2 Mortgage Loans”; and together with the Group 1 Mortgage Loans, the “Mortgage Loans”). The Mortgage Loans have the characteristics as of the Sample Pool Calculation Date described in the collateral tables included in this free writing prospectus.

		The collateral tables included in this free writing prospectus as Appendix A represent a sample pool of Mortgage Loans (the “Sample Pool”) having the characteristics described therein as of the Sample Pool Calculation Date, and do not include additional Mortgage Loans expected to be included in the Trust on the Closing Date. The final pool of Mortgage Loans to be included in the Trust will be different from the Sample Pool, although the characteristics of such final pool will not materially differ from the characteristics of the Sample Pool as indicated herein.

Pass-Through Rate:		The Pass-Through Rate for each class of Certificates will be equal to the least of (a) one-month LIBOR plus the margin for such class, (b) 11.50% per annum and (c) the applicable Net WAC Rate.

Group 1 LPMI Rate:		Approximately [2.86]% of the Group 1 Mortgage Loans, by Sample Pool Calculation Date Balance of the Group 1 Mortgage Loans, are covered by lender-paid mortgage insurance policies. The “Group 1 LPMI Rate” for any period will equal the per annum premium rate of each such insured Group 1 Mortgage Loan for that period expressed as a weighted average rate for the applicable Loan Group 1 Mortgage Loans. As of the Sample Pool Calculation Date, the weighted average Group 1 LPMI Rate is approximately [0.025]% per annum of the Group 1 Mortgage Loans.

Group 1 Net Mortgage Rate:		The “Group 1 Net Mortgage Rate” will be a per annum rate equal to the excess of the weighted average of the mortgage rates on the Group 1 Mortgage Loans minus the sum of (a) a weighted average sub-servicing fee rate (which is expected to be approximately [0.344]% per annum as of the Closing Date), (b) a master servicing fee rate of [0.030]% per annum , and (c) the Group 1 LPMI Rate.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 7 of 46

Group 2 Net Mortgage Rate:		The “Group 2 Net Mortgage Rate” will be a per annum rate equal to the excess of the weighted average of the mortgage rates on the Group 2 Mortgage Loans minus the sum of (a) a sub-servicing fee rate (which is expected to be approximately [0.250]% per annum as of the Closing Date) and (b) a master servicing fee rate of [0.030]% per annum

Group 1 Net WAC Rate:		With respect to the Class 1-A, Class 1-M and Class 1-B Certificates and any Distribution Date, a per annum rate equal to the excess, if any, of (A) a per annum rate equal to the Group 1 Net Mortgage Rate over (B) the sum of (1) a per annum rate equal to the Net Swap Payment with respect to the Group 1 Swap Agreement payable to the Swap Provider on such Distribution Date, divided by the outstanding stated principal balance of the Group 1 Mortgage Loans as of the first day of the calendar month preceding the month in which the Distribution Date occurs, multiplied by 12, and (2) a per annum rate equal to any Swap Termination Payment with respect to the Group 1 Swap Agreement not due to a Swap Provider Trigger Event payable to the Swap Provider on such Distribution Date, divided by the outstanding stated principal balance of the Group 1 Mortgage Loans as of the first day of the calendar month preceding the month in which the Distribution Date occurs, multiplied by 12, less (C) the policy premium rate related to the Class 1-AM Certificates and only with respect to the Class 1-AM Certificates. The Group 1 Net WAC Rate will be adjusted to an effective rate reflecting the accrual of interest on an actual/360 basis.

Group 2 Net WAC Rate:		With respect to the Class 2-A Certificates and any Distribution Date, a per annum rate equal to the excess, if any, of (A) a per annum rate equal to the Group 2 Net Mortgage Rate over (B) the sum of (1) a per annum rate equal to the Net Swap Payment with respect to the Group 2 Swap Agreement payable to the Swap Provider on such Distribution Date, divided by the outstanding Stated Principal Balance of the Group 2 Mortgage Loans as of the first day of the calendar month preceding the month in which the Distribution Date occurs, multiplied by 12, and (2) a per annum rate equal to any Swap Termination Payment with respect to the Group 2 Swap Agreement not due to a Swap Provider Trigger Event payable to the Swap Provider on such Distribution Date, divided by the outstanding Stated Principal Balance of the Group 2 Mortgage Loans as of the first day of the calendar month preceding the month in which the Distribution Date occurs, multiplied by 12, less (C) the policy premium rate related to the Class 2-A Certificates. The Group 2 Net WAC Rate will be adjusted to an effective rate reflecting the accrual of interest on an actual/360 basis.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 8 of 46

Net WAC Rate Shortfall:		Any shortfalls in interest payments on any Class A, Class 1-M or Class 1-B Certificates resulting from the excess, if any, of (a) interest accrued on the related Certificates at one-month LIBOR plus the related margin (up to the maximum rate of 11.50% per annum) over (b) interest accrued on the related Certificates at the related Net WAC Rate (any such shortfalls, “Net WAC Rate Shortfalls”), on each Distribution Date, plus related unpaid Net WAC Rate Shortfalls from prior Distribution Dates to be paid in the current month or carried forward for payment on subsequent Distribution Dates, together with interest thereon at the applicable Pass-Through Rate for the current Distribution Date, as described under “Certificates Priority of Distribution” below.

Swap Agreements:

		Group 1 Swap Agreement
		The Group 1 Certificateholders will benefit from the Group 1 Swap Agreement with notional amounts and swap rates set forth on page 41 of this free writing prospectus. Under the Group 1 Swap Agreement, commencing with the Distribution Date in [April 2007] and ending with the Distribution Date in [December 2013], the Trust shall be obligated to pay the Swap Provider a fixed amount for such Distribution Date equal to the product of (x) a fixed per annum rate for such Distribution Date as set forth on page 41 of this free writing prospectus, (y) the notional amount for such Distribution Date as set forth on page 41 of this free writing prospectus, and (z) a fraction, the numerator of which is 30 (or, for the first Distribution Date, the number of days elapsed from and including the Effective Date (as defined in the Group 1 Swap Agreement) to but excluding the first Distribution Date, determined on a 30/360 basis) and the denominator of which is 360, and (ii) the Swap Provider will be required to pay to the Trust a floating amount for such Distribution Date equal to product of (x) One-Month LIBOR as determined pursuant to the Group 1 Swap Agreement, (y) the notional amount for such Distribution Date as set forth on page 41 of this free writing prospectus, and (z) a fraction, the numerator of which is equal to the actual number of days in the related Calculation Period (as defined in the Group 1 Swap Agreement) and the denominator of which is 360.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 9 of 46

Group 2 Swap Agreement

The Group 2 Certificateholders will benefit from the Group 2 Swap Agreement with notional amounts and swap rates set forth on page 44 of this free writing prospectus. Under the Group 2 Swap Agreement, commencing with the Distribution Date in [April 2007] and ending with the Distribution Date in [November 2016], the Trust shall be obligated to pay the Swap Provider a fixed amount for such Distribution Date equal to the product of (x) a per annum rate for such Distribution Date as set forth on page 44 of this free writing prospectus, (y) the notional amount for such Distribution Date as set forth on page 44 of this free writing prospectus, and (z) a fraction, the numerator of which is 30 (or, for the first Distribution Date, the number of days elapsed from and including the Effective Date (as defined in the Group 2 Swap Agreement) to but excluding the first Distribution Date, determined on a 30/360 basis) and the denominator of which is 360, and (ii) the Swap Provider will be required to pay to the Trust a floating amount for such Distribution Date equal to product of (x) One-Month LIBOR as determined pursuant to the Group 2 Swap Agreement, (y) the notional amount for such Distribution Date as set forth on page 44 of this free writing prospectus, and (z) a fraction, the numerator of which is equal to the actual number of days in the related Calculation Period (as defined in the Group 2 Swap Agreement) and the denominator of which is 360.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 10 of 46

		Under each Swap Agreement described above, only the related net amount of the two obligations will be paid by the appropriate party (the “Group 1 Net Swap Payment” and the “Group 2 Net Swap Payment” respectively) on each Distribution Date. Generally, any Net Swap Payment due to the Swap Provider on any Distribution Date will be paid prior to distributions to the related Certificateholders. Generally, the related Net Swap Payment will be deposited into the related swap account (the “Swap Account”) by the swap administrator pursuant to each related swap administration agreement, and amounts on deposit in the related Swap Account will be distributed in accordance with the terms set forth in the related swap administration agreement. Upon early termination of either Swap Agreement, the Trust or the Swap Provider may be obligated to make a termination payment (the ‘‘Group 1 Swap Termination Payment’’ and “Group 2 Swap Termination Payment”) to the other party, regardless of which party caused the termination. The related Swap Termination Payment will be computed in accordance with the procedures set forth in the related Swap Agreement. In the event that the Trust is required to make a Swap Termination Payment, such amount generally will be paid on the related Distribution Date and on any subsequent Distribution Date until paid in full, prior to distributions to Certificateholders (other than related Swap Termination Payments attributable to a related Swap Provider Trigger Event). The entitlement to certain payments from the related Swap Accounts, as described above, and not the Swap Agreements themselves, will be assets of the Trust.

Yield Maintenance Agreements:		The Group 1 Certificateholders will benefit from two Yield Maintenance Agreements with notional amounts and cap rates as set forth on pages 42 and 43 of this free writing prospectus.

		Group 1 Yield Maintenance Agreement I

		The Group 1 Certificateholders will benefit from the Group 1 Yield Maintenance Agreement I with notional amounts and cap rates set forth on page 42 of this free writing prospectus. Under the Group 1 Yield Maintenance Agreement I, commencing with the Distribution Date in [April 2007], and ending with the Distribution Date in [February 2012], the Group 1 Yield Maintenance Agreement I Provider will be obligated to make a payment for each Distribution Date equal to the product of (x) the excess, if any, of (a) One-Month LIBOR as determined pursuant to the Group 1 Yield Maintenance Agreement I over (b) the related cap rate as set forth on page 42 of this free writing prospectus, (y) the notional amount for such Distribution Date as set forth on page 42 of this free writing prospectus, and (z) a fraction, the numerator of which is equal to the actual number of days in the related calculation period as provided in the Group 1 Yield Maintenance Agreement I, and the denominator of which is 360.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 11 of 46

Group 1 Yield Maintenance Agreement II

The Group 1 Certificateholders will benefit from the Group 1 Yield Maintenance Agreement II with notional amounts and cap rates set forth on page 43 of this free writing prospectus. Under the Group 1 Yield Maintenance Agreement II, on or before each Distribution Date commencing with the Distribution Date in [February 2012], and ending with the Distribution Date in [September 2013], the Group 1 Yield Maintenance Agreement II Provider will be obligated to make a payment for that Distribution Date equal to the product of (x) the excess, if any, of (a) the lesser of (i) One-Month LIBOR as determined pursuant to the Group 1 Yield Maintenance Agreement II and (ii) 11.500% over (b) a cap rate equal to 7.50%, (y) the notional amount for such Distribution Date as set forth on page 43 of this free writing prospectus, and (z) a fraction, the numerator of which is equal to the actual number of days in the related calculation period as provided in the Group 1 Yield Maintenance Agreement II, and the denominator of which is 360.

Group 2 Yield Maintenance Agreement

The Group 2 Certificateholders will benefit from the Group 2 Yield Maintenance Agreement with notional amounts and cap rates set forth on page 45 of this free writing prospectus. Under the Group 2 Yield Maintenance Agreement, commencing with the Distribution Date in [April 2007], and ending with the Distribution Date in [January 2014], the Group 2 Yield Maintenance Agreement Provider will be obligated to make a payment for that Distribution Date equal to the product of (x) the excess, if any, of One-Month LIBOR as determined pursuant to the Group 2 Yield Maintenance Agreement over the related cap rate as set forth on page 45 of this free writing prospectus, (y) the notional amount for such Distribution Date as set forth on page 45 of this free writing prospectus, and (z) a fraction, the numerator of which is equal to the actual number of days in the related calculation period as provided in the Group 2 Yield Maintenance Agreement, and the denominator of which is 360.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 12 of 46

Group 1 Credit Enhancement:	The Trust will include the following credit enhancement mechanisms, each of which is intended to provide credit support for some or all of the Class 1-A, Class 1-M and Class 1-B Certificates, as the case may be:

	1)	Subordination
	2)	Overcollateralization
	3)	Excess Cashflow
	4)	Swap Agreement
	5)	Yield Maintenance Agreements
	6)	Cross-collateralization
	7)	Certificate Guaranty Insurance Policy for the benefit of the Class 1-AM Certificates

	Group 1 Certificates

Class	S&P / Moody’s	Subordination (at closing; as a % of Original Pool Balance) **	Subordination (after Stepdown Date; as a % of Current Pool Balance) **
1-A1-A*	AAA/Aaa	6.95%	13.90%
1-A1-B*	AAA/Aaa	6.95%	13.90%
1-A1-C*	AAA/Aaa	6.95%	13.90%
1-AM	AAA/Aaa	6.95%	13.90%
1-M-1	AA+/Aa1	5.60%	11.20%
1-M-2	AA/Aa2	4.40%	8.80%
1-M-3	AA-/Aa3	3.75%	7.50%
1-M-4	A+/A1	3.15%	6.30%
1-M-5	A/A2	2.65%	5.30%
1-M-6	A-/A3	2.25%	4.50%
1-M-7	BBB+Baa1	1.90%	3.80%
1-M-8	BBB/Baa2	1.55%	3.10%
1-B	BBB-/Baa3	1.15%	2.30%

* Excludes the subordination provided by Class 1-AM.

**Approximate

Group 2 Credit Enhancement:	The Trust will include the following credit enhancement mechanisms, each of which is intended to provide credit support for the Class 2-A Certificates, as the case may be:

	1)	Overcollateralization
	2)	Excess Cashflow
	3)	Swap Agreement
	4)	Yield Maintenance Agreements
	5)	Cross-collateralization
	6)	Certificate Guaranty Insurance Policy for the benefit of the Class 2-A Certificates.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 13 of 46

Subordination:	Group 1 Certificates
		The Class 1-M Certificates and Class 1-B Certificates will be subordinate to, and will provide credit support for, the Class 1-A Certificates. Among the Class 1-M Certificates and Class 1-B Certificates, subordination will rank in priority from highest to lowest in the following order: Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7, Class 1-M-8 and Class 1-B Certificates, with each subsequent class providing credit support for the prior class or classes, if any.

Group 1 Overcollateralization:		With respect to any Distribution Date, the outstanding principal balance of the Group 1 Mortgage Loans as of the last day of the related Due Period less the aggregate Certificate Principal Balance of the Class 1-A, Class 1-M and Class 1-B Certificates (after taking into account all distributions of principal on such Distribution Date).

		Any Realized Losses on the Group 1 Mortgage Loans will be covered first by the related Excess Cashflow and then by the Group 1 Overcollateralization, if any. If the Group 1 Overcollateralization is thereafter reduced, the related Excess Cashflow will be directed to pay principal on the related Certificates, resulting in the limited acceleration of the related Certificates relative to the amortization of the Group 1 Mortgage Loans, until the Group 1 Overcollateralization reaches the Group 1 Overcollateralization Target. Upon this event, the acceleration feature will cease, unless the amount of Group 1 Overcollateralization is reduced below the Group 1 Overcollateralization Target by Realized Losses on the Group 1 Mortgage Loans.

Group 2 Overcollateralization:		With respect to any Distribution Date, the outstanding principal balance of the Group 2 Mortgage Loans as of the last day of the related Due Period less the Certificate Principal Balance of the Class 2-A Certificates (after taking into account all distributions of principal on such Distribution Date).

		Any Realized Losses on the Group 2 Mortgage Loans will be covered first by the related Excess Cashflow and then by the Group 2 Overcollateralization, if any. If the Group 2 Overcollateralization is thereafter reduced, the related Excess Cashflow will be directed to pay principal on the related Certificates, resulting in the limited acceleration of the related Certificates relative to the amortization of the Group 2 Mortgage Loans, until the Group 2 Overcollateralization reaches the Group 2 Overcollateralization Target. Upon this event, the acceleration feature will cease, unless the amount of Group 2 Overcollateralization is reduced below the Group 2 Overcollateralization Target by Realized Losses on the Group 2 Mortgage Loans.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 14 of 46

Overcollateralization Target:		Group 1 Mortgage Loans
		For each Distribution Date prior to the Group 1 Stepdown Date, 1.15% of the aggregate principal balance of the Group 1 Mortgage Loans as of the Cut-off Date (the “Group 1 Overcollateralization Target”). The initial amount of Group 1 Overcollateralization will be approximately 1.15% as of the Cut-off Date.

		On or after the Group 1 Stepdown Date, the Group 1 Overcollateralization Target will be equal to 2.30% of the aggregate principal balance of the Group 1 Mortgage Loans for the related Distribution Date, subject to a floor of 0.50% of the aggregate principal balance of the Group 1 Mortgage Loans as of the Cut-off Date; provided, however, that if a Group 1 Trigger Event (as described herein) is in effect on the related Distribution Date, the Group 1 Overcollateralization Target will be equal to the Group 1 Overcollateralization Target on the prior Distribution Date.

		Group 2 Mortgage Loans
		For each Distribution Date prior to the Group 2 Stepdown Date, 6.25% of the aggregate principal balance of the Group 2 Mortgage Loans as of the Cut-off Date (the “Group 2 Overcollateralization Target”). The initial amount of Group 2 Overcollateralization will be approximately 4.90%

		On or after the Group 2 Stepdown Date, the Group 2 Overcollateralization Target will be equal to [12.50]% of the aggregate principal balance of the Group 2 Mortgage Loans for the related Distribution Date, subject to a floor equal to the greater of (x) 0.50% of the aggregate principal balance of the Group 2 Mortgage Loans as of the Cut-off Date and (y) two times (2x) the current unpaid principal balance of the Group 2 Mortgage Loan that has the largest outstanding principal balance as of the prior Distribution Date; provided, however, that if a Group 2 Trigger Event (as described herein) is in effect on the related Distribution Date, the Group 2 Overcollateralization Target will be equal to the Group 2 Overcollateralization Target on the prior Distribution Date.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 15 of 46

Group 1 Excess Cashflow:		“Group 1 Excess Cashflow” for any Distribution Date will be equal to the available funds for the Group 1 Mortgage Loans remaining after related interest and principal distributions on the Group 1 Certificates (not including the Class 1-C, Class 1-P and Class R Certificates) as described pursuant to clauses (1) to (3) under “Certificates Priority of Distributions - Group 1 Mortgage Loans.”

Group 2 Excess Cashflow:		“Group 2 Excess Cashflow” for any Distribution Date will be equal to the available funds for the Group 2 Mortgage Loans remaining after related interest and principal distributions on the Group 2 Certificates (not including the Class 2-C, Class 2-P and Class R Certificates) as described pursuant to clauses (1) to (3) under “Certificates Priority of Distributions - Group 2 Mortgage Loans.”

Certificate Guaranty Insurance Policy:		Ambac Assurance Corporation will guarantee the ultimate payment of principal and current interest shortfalls on the Class 1-AM Certificates and the Class 2-A Certificates only, except shortfalls and losses resulting from prepayment interest shortfalls, Relief Act shortfalls and Net WAC Rate Shortfalls. Ambac’s claims paying ability is rated “AAA” and “Aaa” by S&P and Moody’s, respectively.

Group 1 Trigger Event:		“Group 1 Trigger Event” will be in effect on any Distribution Date on or after the Group 1 Stepdown Date if either (or both) a Group 1 Delinquency Trigger or a Group 1 Cumulative Loss Trigger is in effect on such Distribution Date.

Group 2 Trigger Event:		“Group 2 Trigger Event” will be in effect on any Distribution Date on or after the Group 2 Stepdown Date if either (or both) a Group 2 Delinquency Trigger or a Group 2 Cumulative Loss Trigger is in effect on such Distribution Date.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 16 of 46

Group 1 Delinquency Trigger:

With respect to the related Certificates, a “Group 1 Delinquency Trigger” will occur if the three month rolling average 60+ day delinquency percentage (including bankruptcy, foreclosures, and REO) for the outstanding Group 1 Mortgage Loans equals or exceeds [43.00]% times the related Senior Enhancement Percentage. As used above, the “Senior Enhancement Percentage” with respect to any Distribution Date is the percentage equivalent of a fraction, (a) the numerator of which is equal to: the excess of (i) the aggregate principal balance of the Group 1 Mortgage Loans for such distribution date (after giving effect to scheduled payments of principal due during the related due period, to the extent received or advanced, and unscheduled collections of principal received during the related prepayment period) over (ii) (1) before the Certificate Principal Balances of the Class 1-A Certificates have been reduced to zero, the sum of the Certificate Principal Balances of the Class 1-A Certificates (after taking into account distribution of the Group 1 Principal Distribution Amount for such distribution date), or (2) after such time, the Certificate Principal Balance of the most senior class of Group 1 Subordinate Certificates outstanding (after taking into account distribution of the Group 1 Principal Distribution Amount for such distribution date) and (b) the denominator of which is equal to the aggregate principal balance of the Group 1 Mortgage Loans for such distribution date (after giving effect to scheduled payments of principal due during the related due period, to the extent received or advanced and unscheduled collections of principal received during the related prepayment period).

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 17 of 46

Group 1 Cumulative Loss Trigger:

With respect to the related Certificates, a “Group 1 Cumulative Loss Trigger” will occur if the aggregate amount of Realized Losses on the Group 1 Mortgage Loans exceeds the applicable percentage of the aggregate principal balance of the Group 1 Mortgage Loans as of the Cut-off Date, as set forth below:

Period (month)	*Percentage*
25 - 36	[0.25]% with respect to April 2009, plus an additional 1/12th of [0.40]% for each month thereafter
37 - 48	[0.65]% with respect to April 2010, plus an additional 1/12th of [0.45]% for each month thereafter
49 - 60	[1.10]% with respect to April 2011, plus an additional 1/12th of [0.45]% for each month thereafter
61 - 72	[1.55]% with respect to April 2012, plus an additional 1/12th of [0.30]% for each month thereafter
73+	[1.85]%

Group 2 Delinquency Trigger:

With respect to the related Certificates, a “Group 2 Delinquency Trigger” will occur if the three month rolling average 60+ day delinquency percentage (including bankruptcy, foreclosure, and REO) for the outstanding Group 2 Mortgage Loans equals or exceeds [10.00]% of the aggregate Stated Principal Balance of the Group 2 Mortgage Loans for any payment date prior to April 2018 and [12.00]% for any payment date on or after April 2018.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 18 of 46

Group 2 Cumulative Loss Trigger:

With respect to the related Certificates, a “Group 2 Cumulative Loss Trigger” will occur if the aggregate amount of Realized Losses on the Group 2 Mortgage Loans exceeds the applicable percentage of the aggregate principal balance of the Group 2 Mortgage Loans as of the Cut-off Date, as set forth below:

Period (month)	*Percentage*
85- 96	[4.75]% with respect to April 2014, plus an additional 1/12th of [1.25]% for each month thereafter
97 - 108	[6.00]% with respect to April 2015, plus an additional 1/12th of [0.35]% for each month thereafter
109 - 120	[6.35]% with respect to April 2016, plus an additional 1/12th of [0.15]% for each month thereafter
121+	[6.50]%

Cross-Collateralization:		On each Distribution Date, Crossable Excess from each Loan Group may be available to cover Crossable Losses on Mortgage Loans in the non-related Loan Group as follows: if on such Distribution Date one Loan Group has Crossable Excess and one Loan Group has Crossable Losses, distributions shall be made from the one Loan Group with Crossable Excess to the Loan Group with Crossable Losses, up to the amount of such Crossable Losses.

Cross-Collateralized Loss Payments:		For any Distribution Date and each Loan Group, the amount, if any, of Crossable Excess from such Loan Group available to cover Crossable Losses in the other Loan Group as provided in “Cross-Collateralization” above.

Crossable Excess:		With respect to each Loan Group and any Distribution Date, an amount equal to the related Excess Cashflow remaining after clause (6) of “Certificates Priority of Distributions - Group 1 Mortgage Loans” and clause (4) of “Certificates Priority of Distributions - Group 2 Mortgage Loans,” respectively, below.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 19 of 46

Crossable Losses:		With respect to each Loan Group and any Distribution Date, an amount equal to the sum of (i) any Realized Losses on the related Mortgage Loans during the related Due Period, to the extent unreimbursed by any related Excess Cashflow on that Distribution Date and (ii) any previously unreimbursed Realized Losses on the related Mortgage Loans, to the extent that such Realized Losses have not been reimbursed by related and non-related Excess Cashflow on prior Distribution Dates.

Allocated Realized Loss Amounts:		With respect to any class of Certificates and any Distribution Date, an amount equal to the sum of any Realized Loss allocated to that class of Certificates on that Distribution Date and any Allocated Realized Loss Amount for that class remaining unpaid from any previous Distribution Date. Allocated Realized Loss Amounts allocated to the Class 1-AM and Class 2-A Certificates will be covered by the Certificate Insurance Policy.

Group 1 Stepdown Date:		The earlier to occur of (x) the Distribution Date following the Distribution Date on which the aggregate Certificate Principal Balance of the Class 1-A Certificates is reduced to zero and (y) the later to occur of: (i) the Distribution Date in April 2010 or (ii) the first Distribution Date on which the aggregate Certificate Principal Balance of the Class 1-A Certificates is less than or equal to 86.10% of the aggregate principal balance of the Group 1 Mortgage Loans for such Distribution Date.

Group 2 Stepdown Date:		The later to occur of (x) the Distribution Date in April 2014 or (y) the first Distribution Date on which the Certificate Principal Balance of the Class 2-A Certificates is less than or equal to 87.50% of the aggregate principal balance of the Group 2 Mortgage Loans for such Distribution Date.

Certificate Principal Balance:		With respect to any Certificate as of any date of determination, the initial Certificate Principal Balance thereof, increased by any subsequent recoveries allocated thereto, and reduced by the aggregate of (a) all amounts allocable to principal previously distributed with respect to such Certificate and (b) any reductions in the Certificate Principal Balance thereof in connection with allocations of Realized Losses.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 20 of 46

Allocation of Losses:		Any Realized Losses on the Group 1 Mortgage Loans not covered by any Group 1 Excess Cashflow, Group 1 Overcollateralization, Group 1 Net Swap Payments from the related Swap Provider, Group 1 Yield Maintenance Payments or Crossable Excess, will be allocated to each class of Class 1-M Certificates and Class 1-B Certificates, in the following order: to the Class 1-B, Class 1-M-8, Class 1-M-7, Class 1-M-6, Class 1-M-5, Class 1-M-4, Class 1-M-3, Class 1-M-2 and Class 1-M-1 Certificates, in each case until the respective Certificate Principal Balance of such class has been reduced to zero. In addition, if the aggregate Certificate Principal Balance of the Class 1-M Certificates and Class 1-B Certificates is reduced to zero as a result of the allocation of Realized Losses on the Group 1 Mortgage Loans, any additional Realized Losses on the Group 1 Mortgage Loans will be allocable first, to the Class 1-AM Certificates until the certificate principal balance is reduced to zero, provided however, any Realized Losses applied to the Class 1-AM Certificates will be covered by the Certificate Guaranty Insurance Policy; and second, to the Class 1-A1-A, Class 1-A1-B and Class 1-A1-C Certificates on a pro rata basis, based on their respective Certificate Principal Balances, until in each case the Certificate Principal Balance thereof is reduced to zero.
.
		Any Realized Losses on the Class 1-AM Certificates not covered by any Group 1 Excess Cashflow, Group 1 Overcollateralization, Group 1 Net Swap Payments from the related Swap Provider, Group 1 Yield Maintenance Payments or Crossable Excess will be covered by the Certificate Guaranty Insurance Policy.

		Any Realized Losses on the Group 2 Mortgage Loans not covered by any Group 2 Excess Cashflow, Group 2 Overcollateralization, Group 2 Net Swap Payments from the related Swap Provider, Group 2 Yield Maintenance Payments, or Crossable Excess will be covered by the Certificate Guaranty Insurance Policy.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 21 of 46

Certificates Priority of Distributions:
	Group 1 Mortgage Loans

	Available funds from the Group 1 Mortgage Loans (which are net of any servicing fees, master servicing fees, private mortgage insurance premium fees and the Certificate Guaranty Insurance Policy premium related to the Class 1-AM Certificates) will be distributed in the following order of priority:

	1)	From available funds to the Group 1 Swap Account, any Group 1 Net Swap Payment and Group 1 Swap Termination Payment for such Distribution Date (other than any Group 1 Swap Termination Payment resulting from a Swap Provider Trigger Event) owed to the Swap Provider;
	2)	From interest funds, current and unpaid interest, to the Class 1-A Certificates, pro rata based on their entitlement,
	3)	From remaining interest funds, to the Certificate Insurer, with respect to the Class 1-AM Certificates, any amounts reimbursable to the Certificate Insurer for the interest portion of any related Insured Payments made pursuant to the Insurance Agreement and any related unpaid Policy Premium;
	4)	From interest funds, to pay current interest sequentially, to the Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7, Class 1-M-8 and Class 1-B Certificates;
	5)	From principal funds, (i) first to the Class 1-A Certificates, as more fully described under “Class 1-A Certificates Principal Distributions” below, and (ii) second, sequentially, to the Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7, Class 1-M-8 and Class 1-B Certificates, each as described more fully under “Principal Paydown” below;
	6)	From Group 1 Excess Cashflow, to the Certificate Insurer, with respect to the Class 1-AM Certificates, any amounts reimbursable to the Certificate Insurer for any related Insured Payments made pursuant to the Insurance Agreement and any related unpaid Policy Premium;
	7)	From Group 1 Excess Cashflow, as principal to the Class 1-A, Class 1-M and Class 1-B Certificates to restore or maintain Overcollateralization, as described under “Overcollateralization Target;”
	8)	From any remaining Group 1 Excess Cashflow, to pay any Allocated Realized Loss Amounts to the Class 1-A Certificates, sequentially to the Class 1-A1 Certificates (on a pro rata basis among the Class 1-A1-A, Class 1-A1-B and Class 1-A1-C Certificates, based on entitlement) and to pay any Allocated Realized loss amounts to Class 1-AM, based on the unpaid Realized Loss amount for such class of Certificates;
	9)	From any remaining Group 1 Excess Cashflow, sequentially to the Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7, Class 1-M-8 and Class 1-B Certificates, in that order, in each case first to pay any unpaid interest for such class and then to pay any Allocated Realized Loss Amounts for such class;
	10)	to the Certificate Insurer, with respect to the Class 2-A Certificates, any amounts reimbursable to the Certificate Insurer for related Insured Payments made pursuant to the Insurance Agreement and any related unpaid Policy Premium, in each case, to the extent not covered by the Net Monthly Excess Cashflow relating to Loan Group 2 on that distribution date;

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 22 of 46

	11)	From any remaining Group 1 Excess Cashflow to the Class 2-A Certificates any Cross-Collateralized Loss Payments;
	12)	From any remaining Group 1 Excess Cashflow, to the related Net WAC Rate shortfall reserve fund to pay the Group 1 Certificates, on a pro rata basis, based on the Certificate Principal Balances thereof, to the extent needed to pay any remaining related Net WAC Rate Shortfalls for each such class; provided that any Group 1 Excess Cashflow remaining after such allocation to pay Net WAC Rate Shortfalls based on the Certificate Principal Balances of these Certificates will be distributed to each such Class of Certificates with respect to which there remains any unpaid Net WAC Rate Shortfalls (after the distribution based on Certificate Principal Balances), pro rata, based on the amount of such unpaid Net WAC Rate Shortfalls;
	13)	To the holders of the Class 2-A Certificates, in respect of the Allocated Realized Loss Amounts for such class to the extent not covered by the Net Monthly Excess Cashflow relating to Loan Group 2 on that distribution date;
	14)	To the Group 1 Swap Account, any Group 1 Swap Termination Payment owed to the Swap Provider specifically due to a Group 1 Swap Provider Trigger Event pursuant to the Group 1 Swap Agreement;
	15)	To the Certificate Insurer, any remaining amounts related to the Group 1 Loans and owed to the Certificate Insurer under the Insurance Agreement;
	16)	To the Certificate Insurer, any remaining amounts related to the Group 2 Loans and owed to the Certificate Insurer under the Insurance Agreement, to the extent not covered by Net Monthly Excess Cashflow from the Group 2 Loans; and
	17)	To the Class 1-C and Class R Certificates, any remaining amounts as described in the pooling and servicing agreement.

	Group 2 Mortgage Loans

	Available funds from the Group 2 Mortgage Loans (which are net of any servicing fees, master servicing fees, private mortgage insurance premium fees and the related Certificate Guaranty Insurance Policy premium) will be distributed in the following order of priority:

	1)	From available funds to the Group 2 Swap Account, any Group 2 Net Swap Payment and Group 2 Swap Termination Payment for such Distribution Date (other than any Swap Termination Payment resulting from a Swap Provider Trigger Event) owed to the Swap Provider;
	2)	From interest funds current and unpaid interest to the Class 2-A Certificates;
	3)	From principal funds to the Class 2-A Certificates, as more fully described under “Class 2-A Certificates Principal Distributions” below;
	4)	From Group 2 Excess Cashflow, to the Certificate Insurer, any unpaid premium amounts and unreimbursed Insured Payments related to the Class 2-A Certificates;
	5)	From Group 2 Excess Cashflow, as principal to the Class 2-A Certificates to restore or maintain Overcollateralization, as described under “Overcollateralization Target”;

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 23 of 46

	6)	To the holders of the Class 2-A Certificates, an amount equal to any Allocated Realized Loss Amount;
	7)	to the Certificate Insurer, with respect to the Class 1-AM Certificates, any amounts reimbursable to the Certificate Insurer for related Insured Payments made pursuant to the Insurance Agreement and any related unpaid Policy Premium, in each case, to the extent not covered by the Net Monthly Excess Cashflow relating to Loan Group 1 on that distribution date;
	8)	From any remaining Group 2 Excess Cashflow (i) first to the Class 1-A Certificates, sequentially to the Class 1-A1 Certificates (on a pro rata basis among the Class 1-A1-A, Class 1-A1-B and Class 1-A1-C Certificates) and Class 1-AM and (ii) second, sequentially to the Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7, Class 1-M-8 and Class 1-B Certificates, any Cross-Collateralized Loss Payments;
	9)	From any remaining Group 2 Excess Cashflow to the related Net WAC Rate shortfall reserve fund to pay the Class 2-A Certificates any remaining related Net WAC Rate Shortfalls;
	10)	From any remaining Group 2 Excess Cashflow to the Group 1 Certificates, (i) first, sequentially to the Class 1-A1 Certificates (on a pro rata basis among the Class 1-A1-A, Class 1-A1-B and Class 1-A1-C Certificates) and the Class 1-AM, in respect of Allocated Realized Loss Amount for such class of Certificates and (ii) second, sequentially to the Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7, Class 1-M-8 and Class 1-B Certificates, in respect of Allocated Realized Loss Amounts for each such Class, to the extent not covered by the Net Monthly Excess Cashflow relating to Loan Group 2 on that distribution date;
	11)	To the Group 2 Swap Account, any Group 2 Swap Termination Payment owed to the Swap Provider specifically due to a Swap Provider Trigger Event pursuant to the Group 2 Swap Agreement;
	12)	To the Certificate Insurer, any remaining amounts related to the Group 2 Loans and owed to the Certificate Insurer under the insurance agreement;
	13)	To the Certificate Insurer, any remaining amounts related to the Group 1 Loans and owed to the Certificate Insurer under the Insurance Agreement, to the extent not covered by Net Monthly Excess Cashflow from the Group 1 Loans; and
	14)	To the Class 2-C and Class-R Certificates, any remaining amounts as described in the pooling and servicing agreement.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 24 of 46

Principal Paydown:

	Group 1 Certificates
	Prior to the Group 1 Stepdown Date or if a Group 1 Trigger Event is in effect on any Distribution Date, 100% of the available principal funds from the Group 1 Mortgage Loans will be paid to the Class 1-A Certificates, as more fully described below under “Class 1-A Certificates Principal Distributions” below; however, if the Class 1-A Certificates have been retired, such amounts will be applied sequentially to the Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7, Class 1-M-8 and Class 1-B Certificates, in that order, in each case until the Certificate Principal Balance thereof is reduced to zero.

	On any Distribution Date on or after the Group 1 Stepdown Date, and if a Group 1 Trigger Event is not in effect on such Distribution Date, the Group 1 Certificates will be entitled to receive payments of principal in the following order of priority in each case until the Certificate Principal Balance thereof is reduced to zero:

	(i)	First to the Class 1-A Certificates, as more fully described below under “Class 1-A Certificates Principal Distribution”, such that the unpaid principal of the Class 1-A Certificates in the aggregate will have 13.90% subordination,
	(ii)	second, to the Class 1-M-1 Certificates such that the Class 1-M-1 Certificates will have approximately 11.20% subordination,
	(iii)	third, to the Class 1-M-2 Certificates such that the Class 1-M-2 Certificates will have approximately 8.80% subordination,
	(iv)	fourth, to the Class 1-M-3 Certificates such that the Class 1-M-3 Certificates will have approximately 7.50% subordination,
	(v)	fifth, to the Class 1-M-4 Certificates such that the Class 1-M-4 Certificates will have approximately 6.30% subordination,
	(vi)	sixth, to the Class 1-M-5 Certificates such that the Class 1-M-5 Certificates will have approximately 5.30% subordination,
	(vii)	seventh, to the Class 1-M-6 Certificates such that the Class 1-M-6 Certificates will have approximately 4.50% subordination,
	(viii)	eighth, to the Class 1-M-7 Certificates such that the Class 1-M-7 Certificates will have approximately 3.80% subordination,
	(ix)	ninth, to the Class 1-M-8 Certificates such that the Class 1-M-8 Certificates will have approximately 3.10% subordination,
	(x)	tenth, to the Class 1-B Certificates such that the Class 1-B Certificates will have approximately 2.30% subordination.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 25 of 46

	Class 1-A Certificates Principal Distributions:

	Principal will be distributed to the Class 1-A Certificates concurrently and pro rata between the Class 1-A1 Certificates and Class 1-AM Certificates based on (x) the aggregate Certificate Principal Balance of the Class 1-A1-A, Class 1-A1-B and Class 1-A1-C Certificates and (y) the Certificate Principal Balance of the Class 1-AM Certificates, which will further be allocated in the following manner:

	(x) sequentially, to the Class 1-A1-A, Class 1-A1-B and Class 1-A1-C Certificates, in that order, in each case until the Class 1-A1-A, Class 1-A1-B and Class 1-A1-C Certificate Principal Balance thereof is reduced to zero; and
	(y) to the Class 1-AM Certificates until the Class 1-AM Certificate Principal Balance thereof is reduced to zero.

	On or after the Stepdown Date and assuming no Group 1 Trigger Event is in effect, principal paid to the Class 1-A Certificates will have approximately 13.90% of the current balance of the related Mortgage Loans as credit enhancement (which is approximately 2x the initial senior enhancement percentage).

	Group 2 Certificates

	Prior to the Group 2 Stepdown Date or if a Group 2 Trigger Event is in effect on any Distribution Date, 100% of the available principal funds from the Group 2 Mortgage Loans will be paid to the Class 2-A Certificates until the Certificate Principal Balance is reduced to zero.

	Class 2-A Certificates Principal Distributions:

	On or after the Stepdown Date and assuming no Group 2 Trigger Event is in effect, principal paid to the Class 2-A Certificates will have approximately [12.50]% of the current balance of the related Mortgage Loans as credit enhancement (which is approximately 2x the initial senior enhancement).

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 26 of 46

Group I Derivative Account:	On or before each Distribution Date, as applicable, Net Swap Payments payable by the Swap Provider to the Derivative Administrator under the Group 1 Swap Agreement and payments payable by each Group 1 Yield Maintenance Agreement Provider to the Derivative Administrator under Group 1 Yield Maintenance Agreement I (other than termination payments) and Group 1 Yield Maintenance Agreement II (other than termination payments) will be deposited by the Derivative Administrator into the Group 1 Derivative Account. On each Distribution Date, to the extent required, the Derivative Administrator will withdraw the following amounts from the Group 1 Derivative Account and remit to the Trustee for distribution to the related certificates (after distribution to the certificates of the related and unrelated Excess Cashflow) in the following order of priority:

	(1)	concurrently to the Class 1-A Certificates, pro rata, based on entitlement, in an amount equal to any unpaid interest shortfall amount for such class or classes to the extent not covered by the related interest remittance amount and the related net monthly Excess Cashflow on that Distribution Date and solely to the extent the unpaid interest shortfall amount is as a result of the interest portion of Realized Losses on the Group 1 Mortgage Loans;

	(2)	sequentially, to the Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7, Class 1-M-8 and Class 1-B Certificates, in that order, in an amount equal to any unpaid interest shortfall amount for such class or classes to the extent not covered by the related interest remittance amount and the related net monthly Excess Cashflow on that Distribution Date and solely to the extent the unpaid interest shortfall amount is as a result of the interest portion of Realized Losses on the Group 1 Mortgage Loans;

	(3)	to the Class 1-A, Class 1-M and Class 1-B Certificates, an amount equal to any related extra principal distribution amount, to the extent not covered by any related or unrelated net monthly Excess Cashflow on that Distribution Date and solely to the extent the payment of the extra principal distribution amount is as a result of current or prior period related Realized Losses, to be included in the related Principal Distribution Amount for that Distribution Date and payable to such holders as part of the related Principal Distribution Amount ;

	(4)	to the related Net WAC reserve fund, to pay Net WAC Rate Shortfalls on the Class 1-A, Class 1-M and Class 1-B Certificates, on a pro rata basis, based on the aggregate amount of Net WAC Rate Shortfalls for such class(es) of Class 1-A, Class 1-M, and Class 1-B Certificates remaining unpaid, to the extent not covered by the related Net Monthly Excess Cashflow on that Distribution Date;

	(5)	to the Class 1-A1 Certificates (pro rata among the class 1-A1-A, Class 1-A1-B and Class 1-A1-C) and Class 1-AM Certificates, sequentially, in an amount equal to any Allocated Realized Loss Amount for such class or classes, to the extent not covered by any related or unrelated net monthly Excess Cashflow on that Distribution Date;

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 27 of 46

	(6)	sequentially to the Class 1-M-1, Class 1-M-2, Class 1-M-3, Class 1-M-4, Class 1-M-5, Class 1-M-6, Class 1-M-7, Class 1-M-8 and Class 1-B Certificates, in an amount equal to any Allocated Realized Loss Amount for such class or classes, to the extent not covered by any related or unrelated net monthly Excess Cashflow on that Distribution Date; and

	(7)	to pay to the parties named in the Pooling and Servicing Agreement any remaining amounts.
Group 2 Derivative Account:	On or before each Distribution Date, as applicable, Net Swap Payments payable by the Swap Provider to the Derivative Administrator under the Group 2 Swap Agreement and payments payable by the Group 2 Yield Maintenance Agreement Provider to the Derivative Administrator under Group 2 Yield Maintenance Agreement (other than termination payments) will be deposited by the Derivative Administrator into the Group 2 Derivative Account. On each Distribution Date, to the extent required, the Derivative Administrator will withdraw the following amounts from the Group 2 Derivative Account and remit to the Trustee for distribution to the related certificates (after distribution to the certificates of the related and unrelated Excess Cashflow) in the following order of priority:

	(1)	to the Class 2-A Certificates an amount equal to any unpaid interest shortfall amount for such class or classes to the extent not covered by the related interest remittance amount and related net monthly Excess Cashflow on that Distribution Date and solely to the extent the unpaid interest shortfall amount is as a result of the interest portion of Realized Losses;

	(2)	to the Class 2-A Certificates an amount equal to any extra principal distribution amount, to the extent not covered by any related and unrelated net monthly Excess Cashflow on that Distribution Date and solely to the extent the payment of the extra principal distribution amount is as a result of current or prior period related Realized Losses, to be included in the related Principal Distribution Amount for that Distribution Date and payable to such holders as part of the related Principal Distribution Amount;

	(3)	to the related Net WAC reserve fund, to pay related Net WAC Rate Shortfalls on the Class 2-A Certificates, based on the aggregate amount of Net WAC Rate Shortfalls for such Class 2-A Certificates remaining unpaid, to the extent not covered by the Group 2 Excess Cashflow on that Distribution Date; and

	(4)	to pay to the parties named in the Pooling and Servicing Agreement any remaining amounts.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 28 of 46

Group 1 Sensitivity Analysis - To 10% Optional Call

Class 1-A1-A (to 10% call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	13.54	1.71	1.24	1.00	0.85	0.76
Modified Duration (years)	9.05	1.57	1.16	0.94	0.81	0.72
First Principal Payment	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007
Last Principal Payment	9/25/2026	6/25/2010	6/25/2009	12/25/2008	8/25/2008	6/25/2008
Principal Lockout (months)	0	0	0	0	0	0
Principal Window (months)	234	39	27	21	17	15
Illustrative Yield (30/360) at Par	5.58	5.59	5.59	5.59	5.60	5.60

Class 1-A1-B (to 10% call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	23.74	5.54	3.90	3.00	2.37	1.95
Modified Duration (years)	12.71	4.59	3.38	2.67	2.15	1.79
First Principal Payment	9/25/2026	6/25/2010	6/25/2009	12/25/2008	8/25/2008	6/25/2008
Last Principal Payment	8/25/2034	3/25/2016	3/25/2013	2/25/2012	2/25/2011	2/25/2010
Principal Lockout (months)	233	38	26	20	16	14
Principal Window (months)	96	70	46	39	31	21
Illustrative Yield (30/360) at Par	5.72	5.72	5.72	5.73	5.73	5.73

Class 1-A1-C (to 10% call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	28.58	12.01	8.05	5.99	4.93	4.16
Modified Duration (years)	13.63	8.40	6.25	4.92	4.17	3.59
First Principal Payment	8/25/2034	3/25/2016	3/25/2013	2/25/2012	2/25/2011	2/25/2010
Last Principal Payment	3/25/2036	7/25/2020	3/25/2016	10/25/2013	7/25/2012	11/25/2011
Principal Lockout (months)	328	107	71	58	46	34
Principal Window (months)	20	53	37	21	18	22
Illustrative Yield (30/360) at Par	5.85	5.86	5.86	5.86	5.86	5.86

Class 1-AM (to 10% call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	20.85	5.41	3.74	2.85	2.32	1.95
Modified Duration (years)	11.54	4.24	3.13	2.48	2.06	1.75
First Principal Payment	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007
Last Principal Payment	3/25/2036	7/25/2020	3/25/2016	10/25/2013	7/25/2012	11/25/2011
Principal Lockout (months)	0	0	0	0	0	0
Principal Window (months)	348	160	108	79	64	56
Illustrative Yield (30/360) at Par	5.69	5.69	5.69	5.70	5.70	5.70

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 29 of 46

Group 1 Sensitivity Analysis - To 10% Optional Call

Class 1-M-1 (to call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.73	8.93	6.13	4.69	4.02	3.7
Modified Duration (years)	13.14	6.62	4.94	3.95	3.47	3.23
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	5/25/2010	6/25/2010
Last Principal Payment	3/25/2036	7/25/2020	3/25/2016	10/25/2013	7/25/2012	11/25/2011
Principal Lockout (months)	273	57	39	36	37	38
Principal Window (months)	75	103	69	43	27	18
Illustrative Yield (30/360) at Par	5.93	5.93	5.93	5.93	5.93	5.93

Class 1-M-2 (to call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.73	8.93	6.13	4.68	4.00	3.66
Modified Duration (years)	13.08	6.60	4.93	3.95	3.45	3.20
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	5/25/2010	6/25/2010
Last Principal Payment	3/25/2036	7/25/2020	3/25/2016	10/25/2013	7/25/2012	11/25/2011
Principal Lockout (months)	273	57	39	36	37	38
Principal Window (months)	75	103	69	43	27	18
Illustrative Yield (30/360) at Par	5.98	5.98	5.98	5.98	5.98	5.98

Class 1-M-3 (to call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.73	8.93	6.13	4.68	4.00	3.63
Modified Duration (years)	12.74	6.52	4.89	3.92	3.43	3.15
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	5/25/2010	5/25/2010
Last Principal Payment	3/25/2036	7/25/2020	3/25/2016	10/25/2013	7/25/2012	11/25/2011
Principal Lockout (months)	273	57	39	36	37	37
Principal Window (months)	75	103	69	43	27	19
Illustrative Yield (30/360) at Par	6.24	6.24	6.24	6.24	6.24	6.24

Class 1-M-4 (to call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.73	8.93	6.13	4.68	3.99	3.61
Modified Duration (years)	12.41	6.44	4.84	3.89	3.40	3.12
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	4/25/2010	5/25/2010
Last Principal Payment	3/25/2036	7/25/2020	3/25/2016	10/25/2013	7/25/2012	11/25/2011
Principal Lockout (months)	273	57	39	36	36	37
Principal Window (months)	75	103	69	43	28	19
Illustrative Yield (30/360) at Par	6.50	6.50	6.50	6.50	6.50	6.50

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 30 of 46

Group 1 Sensitivity Analysis - To 10% Optional Call

Class 1-M-5 (to call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.73	8.93	6.13	4.68	3.97	3.61
Modified Duration (years)	12.28	6.41	4.83	3.88	3.37	3.12
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	4/25/2010	5/25/2010
Last Principal Payment	3/25/2036	7/25/2020	3/25/2016	10/25/2013	7/25/2012	11/25/2011
Principal Lockout (months)	273	57	39	36	36	37
Principal Window (months)	75	103	69	43	28	19
Illustrative Yield (30/360) at Par	6.60	6.61	6.61	6.61	6.61	6.61

Class 1-M-6 (to call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.73	8.90	6.11	4.66	3.95	3.60
Modified Duration (years)	12.28	6.40	4.81	3.87	3.36	3.10
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	4/25/2010	4/25/2010
Last Principal Payment	3/25/2036	7/25/2020	3/25/2016	10/25/2013	7/25/2012	11/25/2011
Principal Lockout (months)	273	57	39	36	36	36
Principal Window (months)	75	103	69	43	28	20
Illustrative Yield (30/360) at Par	6.60	6.61	6.61	6.61	6.61	6.61

Class 1-M-7 (to call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.68	8.72	5.97	4.56	3.92	3.49
Modified Duration (years)	12.28	6.32	4.74	3.80	3.34	3.02
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	4/25/2010	4/25/2010
Last Principal Payment	2/25/2036	1/25/2020	11/25/2015	6/25/2013	5/25/2012	9/25/2011
Principal Lockout (months)	273	57	39	36	36	36
Principal Window (months)	74	97	65	39	26	18
Illustrative Yield (30/360) at Par	6.60	6.61	6.61	6.61	6.61	6.61

Class 1-M-8 (to call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.60	8.45	5.78	4.44	3.85	3.39
Modified Duration (years)	12.26	6.20	4.63	3.72	3.29	2.95
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	4/25/2010	4/25/2010
Last Principal Payment	11/25/2035	2/25/2019	3/25/2015	12/25/2012	3/25/2012	5/25/2011
Principal Lockout (months)	273	57	39	36	36	36
Principal Window (months)	71	86	57	33	24	14
Illustrative Yield (30/360) at Par	6.60	6.61	6.61	6.61	6.61	6.61

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 31 of 46

Group 1 Sensitivity Analysis - To Maturity

Class 1-A1-A (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	13.54	1.71	1.24	1.00	0.85	0.76
Modified Duration (years)	9.05	1.57	1.16	0.94	0.81	0.72
First Principal Payment	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007
Last Principal Payment	9/25/2026	6/25/2010	6/25/2009	12/25/2008	8/25/2008	6/25/2008
Principal Lockout (months)	0	0	0	0	0	0
Principal Window (months)	234	39	27	21	17	15
Illustrative Yield (30/360) at Par	5.58	5.59	5.59	5.59	5.60	5.60

Class 1-A1-B (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	23.74	5.54	3.90	3.00	2.37	1.95
Modified Duration (years)	12.71	4.59	3.38	2.67	2.15	1.79
First Principal Payment	9/25/2026	6/25/2010	6/25/2009	12/25/2008	8/25/2008	6/25/2008
Last Principal Payment	8/25/2034	3/25/2016	3/25/2013	2/25/2012	2/25/2011	2/25/2010
Principal Lockout (months)	233	38	26	20	16	14
Principal Window (months)	96	70	46	39	31	21
Illustrative Yield (30/360) at Par	5.72	5.72	5.72	5.73	5.73	5.73

Class 1-A1-C (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	28.83	13.92	9.58	7.17	5.73	4.69
Modified Duration (years)	13.68	9.13	7.02	5.62	4.69	3.97
First Principal Payment	8/25/2034	3/25/2016	3/25/2013	2/25/2012	2/25/2011	2/25/2010
Last Principal Payment	2/25/2037	5/25/2033	4/25/2027	7/25/2022	6/25/2019	2/25/2017
Principal Lockout (months)	328	107	71	58	46	34
Principal Window (months)	31	207	170	126	101	85
Illustrative Yield (30/360) at Par	5.86	5.89	5.9	5.91	5.9	5.9

Class 1-AM (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	20.90	5.80	4.05	3.09	2.48	2.06
Modified Duration (years)	11.55	4.39	3.29	2.63	2.17	1.83
First Principal Payment	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007
Last Principal Payment	2/25/2037	5/25/2033	4/25/2027	7/25/2022	6/25/2019	2/25/2017
Principal Lockout (months)	0	0	0	0	0	0
Principal Window (months)	359	314	241	184	147	119
Illustrative Yield (30/360) at Par	5.69	5.70	5.70	5.71	5.71	5.71

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 32 of 46

Group 1 Sensitivity Analysis - To Maturity

Class 1-M-1 (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.84	9.52	6.60	5.04	4.23	3.82
Modified Duration (years)	13.16	6.86	5.19	4.17	3.62	3.32
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	5/25/2010	6/25/2010
Last Principal Payment	12/25/2036	7/25/2025	2/25/2020	10/25/2016	7/25/2014	12/25/2012
Principal Lockout (months)	273	57	39	36	37	38
Principal Window (months)	84	163	116	79	51	31
Illustrative Yield (30/360) at Par	5.93	5.94	5.94	5.94	5.94	5.94

Class 1-M-2 (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.83	9.42	6.52	4.97	4.16	3.76
Modified Duration (years)	13.09	6.80	5.14	4.13	3.56	3.27
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	5/25/2010	6/25/2010
Last Principal Payment	11/25/2036	6/25/2024	5/25/2019	2/25/2016	1/25/2014	8/25/2012
Principal Lockout (months)	273	57	39	36	37	38
Principal Window (months)	83	150	107	71	45	27
Illustrative Yield (30/360) at Par	5.98	5.99	5.99	5.99	5.99	5.99

Class 1-M-3 (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.81	9.31	6.43	4.91	4.11	3.71
Modified Duration (years)	12.75	6.68	5.05	4.06	3.50	3.21
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	5/25/2010	5/25/2010
Last Principal Payment	9/25/2036	4/25/2023	6/25/2018	6/25/2015	6/25/2013	6/25/2012
Principal Lockout (months)	273	57	39	36	37	37
Principal Window (months)	81	136	96	63	38	26
Illustrative Yield (30/360) at Par	6.24	6.25	6.26	6.26	6.25	6.25

Class 1-M-4 (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.79	9.21	6.35	4.84	4.05	3.68
Modified Duration (years)	12.42	6.56	4.96	3.99	3.44	3.17
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	4/25/2010	5/25/2010
Last Principal Payment	8/25/2036	6/25/2022	10/25/2017	12/25/2014	2/25/2013	4/25/2012
Principal Lockout (months)	273	57	39	36	36	37
Principal Window (months)	80	126	88	57	35	24
Illustrative Yield (30/360) at Par	6.50	6.51	6.52	6.52	6.51	6.51

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 33 of 46

Group 1 Sensitivity Analysis - To Maturity

Class 1-M-5 (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.77	9.08	6.24	4.76	3.99	3.66
Modified Duration (years)	12.29	6.48	4.89	3.93	3.39	3.15
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	4/25/2010	5/25/2010
Last Principal Payment	6/25/2036	10/25/2021	2/25/2017	6/25/2014	10/25/2012	3/25/2012
Principal Lockout (months)	273	57	39	36	36	37
Principal Window (months)	78	118	80	51	31	23
Illustrative Yield (30/360) at Par	6.60	6.61	6.61	6.62	6.61	6.61

Class 1-M-6 (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.73	8.92	6.12	4.67	3.95	3.60
Modified Duration (years)	12.28	6.41	4.82	3.87	3.36	3.11
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	4/25/2010	4/25/2010
Last Principal Payment	4/25/2036	11/25/2020	6/25/2016	12/25/2013	7/25/2012	12/25/2011
Principal Lockout (months)	273	57	39	36	36	36
Principal Window (months)	76	107	72	45	28	21
Illustrative Yield (30/360) at Par	6.60	6.61	6.61	6.61	6.61	6.61

Class 1-M-7 (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.68	8.72	5.97	4.56	3.92	3.49
Modified Duration (years)	12.28	6.32	4.74	3.80	3.34	3.02
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	4/25/2010	4/25/2010
Last Principal Payment	2/25/2036	1/25/2020	11/25/2015	6/25/2013	5/25/2012	9/25/2011
Principal Lockout (months)	273	57	39	36	36	36
Principal Window (months)	74	97	65	39	26	18
Illustrative Yield (30/360) at Par	6.60	6.61	6.61	6.61	6.61	6.61

Class 1-M-8 (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	26.60	8.45	5.78	4.44	3.85	3.39
Modified Duration (years)	12.26	6.20	4.63	3.72	3.29	2.95
First Principal Payment	1/25/2030	1/25/2012	7/25/2010	4/25/2010	4/25/2010	4/25/2010
Last Principal Payment	11/25/2035	2/25/2019	3/25/2015	12/25/2012	3/25/2012	5/25/2011
Principal Lockout (months)	273	57	39	36	36	36
Principal Window (months)	71	86	57	33	24	14
Illustrative Yield (30/360) at Par	6.60	6.61	6.61	6.61	6.61	6.61

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 34 of 46

Group 2 Sensitivity Analysis - To 10% Optional Call

Class 2-A (to 10% call)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	19.40	8.07	6.17	5.03	4.29	3.77
Modified Duration (years)	10.80	5.86	4.79	4.08	3.58	3.21
First Principal Payment	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007
Last Principal Payment	12/25/2036	3/25/2025	11/25/2020	12/25/2017	3/25/2016	12/25/2014
Principal Lockout (months)	0	0	0	0	0	0
Principal Window (months)	357	216	164	129	108	93
Illustrative Yield (30/360) at Par	5.72	5.72	5.72	5.72	5.72	5.73

Group 2 Sensitivity Analysis - To Maturity

Class 2-A (to maturity)
% of Prepayment Assumption	0%	50%	75%	100%	125%	150%
Average Life (years)	19.41	8.50	6.52	5.32	4.53	3.96
Modified Duration (years)	10.80	5.98	4.93	4.22	3.71	3.32
First Principal Payment	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007	4/25/2007
Last Principal Payment	2/25/2037	12/25/2036	4/25/2033	9/25/2028	10/25/2024	1/25/2022
Principal Lockout (months)	0	0	0	0	0	0
Principal Window (months)	359	357	313	258	211	178
Illustrative Yield (30/360) at Par	5.72	5.73	5.73	5.73	5.73	5.73

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 35 of 46

Group 1 Excess Interest - Forward Indices
Period	Excess Interest (%)	Period	Excess Interest (%)
1	1.48	45	1.39
2	0.92	46	1.27
3	0.75	47	1.26
4	0.98	48	1.60
5	0.88	49	1.25
6	0.97	50	1.36
7	1.21	51	1.24
8	1.11	52	1.35
9	1.24	53	1.23
10	1.20	54	1.23
11	1.22	55	1.34
12	1.35	56	1.22
13	1.25	57	1.34
14	1.33	58	1.20
15	1.28	59	1.25
16	1.36	60	2.16
17	1.30	61	1.82
18	1.31	62	1.98
19	1.38	63	1.78
20	1.31	64	1.94
21	1.39	65	1.75
22	1.32	66	1.76
23	1.32	67	1.92
24	1.57	68	1.74
25	1.32	69	1.90
26	1.41	70	1.73
27	1.33	71	1.73
28	1.41	72	2.26
29	1.32	73	1.74
30	1.32	74	1.92
31	1.41	75	1.74
32	1.31	76	1.92
33	1.40	77	1.75
34	1.30	78	1.76
35	1.29	79	1.93
36	1.60
37	1.37
38	1.46
39	1.34
40	1.44
41	1.32
42	1.31
43	1.41
44	1.29

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 36 of 46

Group 1 Available Funds Cap -Indices @ Spot
Period	Class 1-A , 1-M, 1-B (%)	Period	Class 1-A, 1-M, 1-B (%)
1	7.16	41	6.33
2	6.44	42	6.33
3	6.23	43	6.54
4	6.44	44	6.33
5	6.23	45	6.54
6	6.24	46	6.32
7	6.44	47	6.32
8	6.24	48	6.98
9	6.44	49	6.32
10	6.24	50	6.54
11	6.24	51	6.32
12	6.67	52	6.54
13	6.24	53	6.32
14	6.45	54	6.32
15	6.24	55	6.54
16	6.45	56	6.33
17	6.24	57	6.54
18	6.24	58	6.33
19	6.45	59	6.40
20	6.24	60	7.63
21	6.45	61	7.15
22	6.24	62	7.37
23	6.24	63	7.11
24	6.87	64	7.33
25	6.25	65	7.07
26	6.46	66	7.05
27	6.25	67	7.27
28	6.46	68	7.02
29	6.25	69	7.24
30	6.25	70	7.00
31	6.46	71	7.00
32	6.25	72	7.74
33	6.46	73	6.99
34	6.25	74	7.22
35	6.25	75	6.98
36	6.93	76	7.21
37	6.35	77	6.97
38	6.55	78	6.97
39	6.34	79	7.20
40	6.55

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 37 of 46

Group 1 Available Funds Cap -Indices @ 20%
Period	Class 1-A , 1-M, 1-B (%)	Period	Class 1-A, 1-M, 1-B (%)
1	7.16	41	6.38
2	6.44	42	6.39
3	6.23	43	6.62
4	6.44	44	6.40
5	6.23	45	6.61
6	6.24	46	6.40
7	6.44	47	6.40
8	6.24	48	7.09
9	6.44	49	6.42
10	6.24	50	6.64
11	6.24	51	6.42
12	6.67	52	6.63
13	6.24	53	6.42
14	6.45	54	6.43
15	6.24	55	6.66
16	6.45	56	6.44
17	6.24	57	6.66
18	6.24	58	6.45
19	6.45	59	6.69
20	6.24	60	8.70
21	6.45	61	8.15
22	6.25	62	8.38
23	6.25	63	8.07
24	6.93	64	8.29
25	6.26	65	7.99
26	6.47	66	8.35
27	6.26	67	8.59
28	6.47	68	8.27
29	6.26	69	8.51
30	6.26	70	8.22
31	6.47	71	8.21
32	6.26	72	9.47
33	6.47	73	8.55
34	6.27	74	8.82
35	6.28	75	8.52
36	7.01	76	8.79
37	6.40	77	8.49
38	6.61	78	8.75
39	6.39	79	9.04
40	6.60

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 38 of 46

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 39 of 46

Group 2 Excess Interest - Forward Indices

Period	Class 2-A (%)	Period	Class 2-A (%)	Period	Class 2-A (%)	Period	Class 2-A (%)
1	1.11	41	0.96	81	2.09	121	2.26
2	0.58	42	0.96	82	2.06	122	2.42
3	0.42	43	1.01	83	2.13	123	2.26
4	0.62	44	0.96	84	2.12	124	2.42
5	0.56	45	1.01	85	2.21	125	2.25
6	0.62	46	0.96	86	2.09	126	2.25
7	0.73	47	0.97	87	2.00	127	2.41
8	0.69	48	1.09	88	1.88	128	2.25
9	0.80	49	0.97	89	1.80	129	2.41
10	0.75	50	1.02	90	1.68
11	0.78	51	1.01	91	1.68
12	0.95	52	1.08	92	1.66
13	0.83	53	1.06	93	1.68
14	0.92	54	1.07	94	1.66
15	0.87	55	1.14	95	1.67
16	0.95	56	1.09	96	1.69
17	0.90	57	1.17	97	1.67
18	0.90	58	1.12	98	1.72
19	0.98	59	1.48	99	1.67
20	0.92	60	1.67	100	1.73
21	0.98	61	1.53	101	1.68
22	0.92	62	1.62	102	1.68
23	0.92	63	1.56	103	1.76
24	1.10	64	1.65	104	1.67
25	0.92	65	1.62	105	1.77
26	0.98	66	1.64	106	1.65
27	0.93	67	1.73	107	1.67
28	0.99	68	1.67	108	1.80
29	0.93	69	1.77	109	1.66
30	0.93	70	1.71	110	1.81
31	1.00	71	1.75	111	1.65
32	0.94	72	2.00	112	1.81
33	1.00	73	1.80	113	1.66
34	0.94	74	1.89	114	1.66
35	0.95	75	1.85	115	1.82
36	1.12	76	1.94	116	1.66
37	0.95	77	1.91	117	1.82
38	1.01	78	1.93	118	1.69
39	0.95	79	2.03	119	2.21
40	1.01	80	1.99	120	2.74

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 40 of 46

Group 2 Available Funds Cap -Indices @ Spot
Period	Class 2-A (%)	Period	Class 2-A (%)	Period	Class 2-A (%)	Period	Class 2-A (%)
1	6.54	41	5.74	81	6.57	121	7.10
2	5.88	42	5.74	82	6.40	122	7.34
3	5.70	43	5.92	83	6.43	123	7.10
4	5.88	44	5.74	84	6.83	124	7.34
5	5.70	45	5.92	85	6.46	125	7.10
6	5.70	46	5.74	86	6.67	126	7.10
7	5.88	47	5.74	87	6.46	127	7.34
8	5.70	48	6.08	88	6.67	128	7.10
9	5.88	49	5.74	89	6.45	129	7.33
10	5.70	50	5.91	90	6.45
11	5.70	51	5.74	91	6.67
12	5.99	52	5.92	92	6.45
13	5.70	53	5.74	93	6.67
14	5.88	54	5.74	94	6.46
15	5.70	55	5.93	95	6.46
16	5.88	56	5.74	96	6.82
17	5.70	57	5.92	97	6.47
18	5.70	58	5.74	98	6.68
19	5.88	59	6.24	99	6.47
20	5.70	60	6.63	100	6.69
21	5.88	61	6.29	101	6.48
22	5.70	62	6.50	102	6.48
23	5.70	63	6.30	103	6.70
24	6.08	64	6.51	104	6.48
25	5.70	65	6.30	105	6.70
26	5.88	66	6.31	106	6.49
27	5.70	67	6.52	107	6.49
28	5.88	68	6.31	108	6.81
29	5.70	69	6.53	109	6.50
30	5.70	70	6.32	110	6.72
31	5.88	71	6.32	111	6.50
32	5.70	72	6.84	112	6.72
33	5.88	73	6.33	113	6.51
34	5.70	74	6.55	114	6.51
35	5.74	75	6.34	115	6.73
36	6.11	76	6.55	116	6.51
37	5.74	77	6.35	117	6.73
38	5.92	78	6.35	118	6.55
39	5.74	79	6.57	119	7.07
40	5.92	80	6.36	120	7.87

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 41 of 46

Group 2 Available Funds Cap -Indices @ 20%
Period	Class 2-A (%)	Period	Class 2-A (%)	Period	Class 2-A (%)	Period	Class 2-A (%)
1	6.54	41	5.83	81	8.79	121	10.44
2	5.89	42	5.83	82	8.59	122	10.80
3	5.70	43	6.02	83	8.68	123	10.45
4	5.89	44	5.83	84	9.67	124	10.84
5	5.70	45	6.02	85	8.75	125	10.80
6	5.70	46	5.83	86	9.05	126	10.83
7	5.89	47	5.85	87	8.76	127	11.19
8	5.70	48	6.48	88	9.09	128	10.84
9	5.89	49	5.85	89	8.83	129	11.20
10	5.70	50	6.05	90	8.85
11	5.70	51	5.85	91	9.16
12	6.09	52	6.05	92	8.87
13	5.70	53	5.88	93	9.18
14	5.89	54	5.88	94	8.92
15	5.70	55	6.08	95	8.96
16	5.89	56	5.88	96	9.95
17	5.70	57	6.07	97	9.00
18	5.70	58	5.90	98	9.31
19	5.89	59	6.97	99	9.02
20	5.70	60	7.55	100	9.36
21	5.89	61	7.07	101	9.10
22	5.70	62	7.31	102	9.12
23	5.70	63	7.08	103	9.44
24	6.31	64	7.33	104	9.15
25	5.70	65	7.50	105	9.46
26	5.89	66	7.53	106	9.17
27	5.70	67	7.80	107	9.18
28	5.89	68	7.55	108	9.82
29	5.70	69	7.81	109	9.20
30	5.70	70	7.58	110	9.52
31	5.89	71	7.99	111	9.22
32	5.70	72	8.89	112	9.54
33	5.89	73	8.04	113	9.24
34	5.71	74	8.32	114	9.26
35	5.79	75	8.06	115	9.57
36	6.42	76	8.35	116	9.28
37	5.80	77	8.42	117	9.60
38	5.99	78	8.47	118	9.40
39	5.80	79	8.76	119	10.36
40	5.99	80	8.49	120	11.56

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 42 of 46

Group 1 Swap Agreement Notional Balance Schedule

Period	Notional Balance ($)	Rate (%)	Period	Notional Balance ($)	Rate(%)
1	926,923,120.00	5.04278	43	142,216,456.53	5.02723
2	921,060,281.16	5.04283	44	137,856,990.06	5.02723
3	911,816,416.34	5.04286	45	133,629,967.14	5.02723
4	899,140,908.27	5.04287	46	129,531,494.63	5.02723
5	883,014,097.50	5.04287	47	125,557,511.85	5.02723
6	863,447,920.28	5.04284	48	121,704,500.59	5.02723
7	840,490,180.72	5.04280	49	117,968,674.95	5.02723
8	814,230,839.08	5.04273	50	114,346,521.33	5.02723
9	784,819,533.81	5.04263	51	110,834,668.34	5.02723
10	752,470,487.02	5.04250	52	107,429,746.74	5.02723
11	718,501,223.34	5.04232	53	104,128,499.36	5.02723
12	683,260,413.12	5.04204	54	100,927,691.06	5.02723
13	649,432,954.17	5.04178	55	97,824,358.65	5.02723
14	617,237,264.80	5.04153	56	94,815,600.86	5.02723
15	586,595,124.82	5.04126	57	91,898,528.22	5.02723
16	557,431,882.58	5.04099	58	77,974,653.10	5.05179
17	529,676,574.58	5.04072	59	40,437,859.57	5.08955
18	503,261,494.06	5.04043	60	17,001,443.40	4.91443
19	478,122,437.88	5.04014	61	1,683,591.99	4.91900
20	454,198,281.36	5.03985	62	1,631,694.30	4.91900
21	431,430,415.82	5.03954	63	1,581,380.86	4.91900
22	409,763,333.29	5.03956	64	1,532,603.67	4.91900
23	388,935,239.64	5.03923	65	1,485,316.19	4.91900
24	369,055,755.29	5.03890	66	1,439,473.26	4.91900
25	349,917,762.96	5.03855	67	1,395,031.10	4.91900
26	331,691,588.04	5.03818	68	1,351,947.24	4.91900
27	314,460,162.00	5.03781	69	1,310,180.48	4.91900
28	298,150,731.66	5.03744	70	1,269,690.89	4.91900
29	282,699,778.48	5.03706	71	1,230,439.72	4.91900
30	268,065,485.57	5.03667	72	1,192,389.39	4.91900
31	254,192,756.79	5.03627	73	1,155,503.47	4.91900
32	241,045,890.63	5.03586	74	1,119,746.60	4.91900
33	228,573,225.49	5.03544	75	1,085,084.50	4.91900
34	216,718,022.90	5.03501	76	1,051,483.95	4.91900
35	215,174,568.37	5.03548	77	1,018,912.68	4.91900
36	229,394,896.12	5.03349	78	987,339.44	4.91900
37	171,396,041.21	5.02722	79	956,733.91	4.91900
38	166,150,337.31	5.02722	80	927,066.66	4.91900
39	161,063,882.82	5.02722	81	898,309.19	4.91900
40	156,131,777.89	5.02722
41	151,349,585.69	5.02723
42	146,712,602.28	5.02723

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 43 of 46

Group 1 Yield Maintenance Agreement I Notional Balance Schedule

Period	Notional Balance ($)	Cap Rate (%)	Period	Notional Balance ($)	Cap Rate (%)
1	258,606,880.00	5.14525	31	117,188,855.00	5.14610
2	256,989,905.00	5.14532	32	113,607,570.00	5.14610
3	254,808,565.00	5.14540	33	110,135,005.00	5.14610
4	252,061,780.00	5.14548	34	106,767,830.00	5.14611
5	248,751,905.00	5.14556	35	93,734,190.00	5.15888
6	244,884,880.00	5.14564	36	65,468,970.00	5.13926
7	240,470,395.00	5.14573	37	63,465,830.00	5.13926
8	235,522,085.00	5.14582	38	61,523,440.00	5.13926
9	230,056,970.00	5.14591	39	59,640,000.00	5.13926
10	224,096,125.00	5.14600	40	57,813,740.00	5.13926
11	217,664,315.00	5.14610	41	56,042,940.00	5.13926
12	211,043,050.00	5.14610	42	54,326,000.00	5.13926
13	204,621,910.00	5.14610	43	52,661,130.00	5.13926
14	198,394,810.00	5.14610	44	51,046,870.00	5.13926
15	192,355,825.00	5.14610	45	49,481,710.00	5.13926
16	186,499,390.00	5.14610	46	47,964,100.00	5.13926
17	180,819,995.00	5.14610	47	46,492,610.00	5.13926
18	175,312,440.00	5.14610	48	45,065,860.00	5.13926
19	169,971,420.00	5.14610	49	43,682,590.00	5.13926
20	164,791,790.00	5.14610	50	42,341,350.00	5.13926
21	159,768,975.00	5.14610	51	41,040,940.00	5.13927
22	154,898,240.00	5.14610	52	39,780,180.00	5.13927
23	150,174,805.00	5.14610	53	38,557,790.00	5.13927
24	145,594,300.00	5.14610	54	37,372,580.00	5.13927
25	141,152,465.00	5.14610	55	36,223,440.00	5.13927
26	136,845,240.00	5.14610	56	35,109,350.00	5.13927
27	132,668,365.00	5.14610	57	34,029,210.00	5.13927
28	128,618,095.00	5.14610	58	32,981,990.00	5.13927
29	124,690,530.00	5.14610	59	17,172,360.00	5.19539
30	120,881,980.00	5.14610

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 44 of 46

Group 1 Yield Maintenance Agreement II Notional Balance Schedule

Period	Notional Balance ($)	Period	Notional Balance ($)
59	257,406,829.21	72	138,031,729.59
60	242,452,629.91	73	133,891,860.65
61	228,156,091.02	74	129,876,512.54
62	214,909,564.77	75	125,981,772.96
63	202,628,835.52	76	122,203,857.00
64	191,238,695.56	77	118,539,103.06
65	180,672,422.64	78	114,983,968.64
66	170,979,755.90
67	163,110,548.80
68	156,648,474.37
69	151,269,673.50
70	146,701,343.62
71	142,300,163.65

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 45 of 46

Group 2 Swap Agreement Notional Balance Schedule

Period	Notional Balance ($)	Rate (%)	Period	Notional Balance ($)	Rate (%)	Period	Notional Balance ($)	Rate (%)
1	123,094,237.40	5.33325	41	99,574,185.60	5.33714	81	27,827,192.00	5.33534
2	122,867,859.40	5.33324	42	99,291,962.20	5.33715	82	26,962,816.40	5.33534
3	122,632,075.20	5.33323	43	99,010,294.80	5.33717	83	26,124,969.80	5.33534
4	122,386,952.40	5.33323	44	98,729,198.60	5.33718	84	63,056,826.35	5.28425
5	122,132,393.20	5.33323	45	98,448,737.60	5.33720	85	61,004,282.05	5.28431
6	121,868,511.20	5.33322	46	98,168,903.00	5.33721	86	59,007,329.82	5.28436
7	121,595,369.20	5.33322	47	97,889,610.60	5.33722	87	58,267,803.82	5.28371
8	121,313,144.20	5.33322	48	97,610,784.20	5.33724	88	57,551,023.22	5.28307
9	121,021,973.40	5.33322	49	97,332,541.40	5.33725	89	56,856,305.02	5.28243
10	120,721,746.60	5.33322	50	95,990,912.80	5.33881	90	56,182,958.82	5.28179
11	120,412,540.80	5.33323	51	86,599,548.60	5.33541	91	55,530,324.02	5.28116
12	120,094,621.20	5.33323	52	80,753,545.40	5.32947	92	54,897,785.02	5.28054
13	119,768,077.60	5.33323	53	74,395,417.40	5.31420	93	54,284,731.82	5.27992
14	119,432,899.80	5.33324	54	73,828,441.80	5.31256	94	53,444,422.76	5.27944
15	119,089,488.20	5.33324	55	71,646,412.40	5.30952	95	51,990,365.94	5.27932
16	118,740,232.60	5.33325	56	63,041,030.80	5.32392	96	50,575,740.67	5.27919
17	118,387,004.40	5.33326	57	61,428,128.60	5.32259	97	49,199,494.97	5.27907
18	118,031,179.40	5.33327	58	59,593,266.00	5.32227	98	47,860,570.54	5.27895
19	117,672,725.20	5.33329	59	57,814,097.80	5.32193	99	46,557,943.77	5.27883
20	117,312,966.00	5.33331	60	56,088,946.60	5.32159	100	45,290,629.07	5.27871
21	116,953,707.00	5.33333	61	54,416,160.80	5.32124	101	44,057,695.19	5.27858
22	116,595,629.20	5.33336	62	52,794,154.40	5.32088	102	42,858,190.11	5.27846
23	116,238,682.20	5.33338	63	51,221,394.40	5.32051	103	41,691,194.15	5.27834
24	115,882,786.60	5.33340	64	49,696,378.60	5.32013	104	40,555,850.55	5.27822
25	115,527,996.20	5.33342	65	48,217,665.00	5.31975	105	39,451,296.13	5.27810
26	115,174,143.00	5.33345	66	46,783,892.00	5.31935	106	38,376,674.67	5.27798
27	112,400,240.60	5.33609	67	45,393,668.00	5.31895	107	37,331,189.89	5.27786
28	110,332,117.60	5.33525	68	44,045,649.60	5.31853	108	36,314,058.10	5.27774
29	109,138,992.60	5.33383	69	42,738,586.20	5.31811	109	35,324,487.08	5.27762
30	108,816,060.00	5.33386	70	41,471,223.40	5.31767	110	34,361,740.93	5.27750
31	104,170,458.20	5.33430	71	40,242,349.20	5.31723	111	33,425,095.54	5.27738
32	102,143,035.00	5.33700	72	39,050,831.00	5.31677	112	32,069,907.68	5.27392
33	101,854,980.40	5.33701	73	37,895,512.60	5.31630	113	29,532,618.25	5.25230
34	101,567,621.20	5.33703	74	36,775,283.00	5.31582	114	7,172,425.40	5.23464
35	101,280,887.20	5.33704	75	35,689,094.80	5.31533	115	5,059,925.00	5.16379
36	100,994,909.60	5.33706	76	34,635,921.20	5.31483	116	1,432,390.00	5.09500
37	100,709,485.00	5.33708	77	33,614,754.40	5.31432
38	100,424,663.40	5.33709	78	32,624,619.80	5.31380
39	100,140,519.40	5.33711	79	31,664,591.00	5.31326
40	99,856,967.20	5.33712	80	30,733,728.40	5.31271

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 46 of 46

Group 2 Yield Maintenance Agreement Notional Balance Schedule

Period	Notional Balance ($)	Cap Rate (%)	Period	Notional Balance ($)	Cap Rate (%)
1	59,823,600.00	4.98150	42	37,474,650.00	4.98200
2	59,720,400.00	4.98150	43	37,273,500.00	4.98200
3	59,607,000.00	4.98150	44	37,073,700.00	4.98200
4	59,484,000.00	4.98150	45	36,874,800.00	4.98200
5	59,350,800.00	4.98150	46	36,676,800.00	4.98200
6	59,208,000.00	4.98150	47	36,480,150.00	4.98200
7	59,055,600.00	4.98150	48	36,284,400.00	4.98200
8	58,893,000.00	4.98150	49	36,090,000.00	4.98200
9	58,720,800.00	4.98150	50	35,896,500.00	4.98200
10	58,539,000.00	4.98150	51	35,703,900.00	4.98200
11	58,347,600.00	4.98150	52	35,512,200.00	4.98200
12	58,147,200.00	4.98150	53	35,321,850.00	4.98200
13	57,937,200.00	4.98150	54	35,132,400.00	4.98200
14	57,717,600.00	4.98150	55	34,943,850.00	4.98200
15	57,489,000.00	4.98150	56	34,756,200.00	4.98200
16	57,251,400.00	4.98150	57	34,569,900.00	4.98200
17	57,004,800.00	4.98150	58	34,384,500.00	4.98200
18	56,749,200.00	4.98150	59	11,400,000.00	4.92600
19	56,484,600.00	4.98150	60	11,338,800.00	4.92600
20	56,211,600.00	4.98150	61	11,278,050.00	4.92600
21	55,930,200.00	4.98150	62	11,217,600.00	4.92600
22	55,639,800.00	4.98150	63	11,157,450.00	4.92600
23	55,341,600.00	4.98150	64	11,097,600.00	4.92600
24	55,044,600.00	4.98150	65	11,038,050.00	4.92600
25	54,749,400.00	4.98150	66	10,978,800.00	4.92600
26	54,456,000.00	4.98150	67	10,919,850.00	4.92600
27	54,163,800.00	4.98150	68	10,861,350.00	4.92600
28	53,873,400.00	4.98150	69	10,803,150.00	4.92600
29	53,584,200.00	4.98150	70	10,745,250.00	4.92600
30	53,296,800.00	4.98150	71	10,687,650.00	4.92600
31	53,011,200.00	4.98150	72	10,630,350.00	4.92600
32	52,726,800.00	4.98150	73	10,573,350.00	4.92600
33	52,444,200.00	4.98150	74	10,516,650.00	4.92600
34	52,162,800.00	4.98150	75	10,460,250.00	4.92600
35	38,912,400.00	4.98200	76	10,404,150.00	4.92600
36	38,703,600.00	4.98200	77	10,348,350.00	4.92600
37	38,496,150.00	4.98200	78	10,292,850.00	4.92600
38	38,289,600.00	4.98200	79	10,237,650.00	4.92600
39	38,084,400.00	4.98200	80	10,182,750.00	4.92600
40	37,880,100.00	4.98200	81	10,128,150.00	4.92600
41	37,676,700.00	4.98200	82	10,073,850.00	4.92600

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 47 of 46

Contact Information

Bear Stearns’ Banking Contacts

Name:	Telephone:	E-Mail:

Matthew Perkins Senior Managing Director	(212) 272-7977	mperkins@bear.com

Josephine Musso Managing Director	(212) 272-6033	jmusso@bear.com

Andrew Wernick Vice-President	(212) 272-5451	awernick@bear.com

Jacqueline Amato Analyst / Collateral	(212) 272-9529	jamato@bear.com

Bear Stearns’ Trading Contacts

Name:	Telephone:	E-Mail:

Scott Eichel Senior Managing Director	(212) 272-5451	seichel@bear.com

Carol Fuller Senior Managing Director	(212) 272-4955	cfuller@bear.com

Jayme Fagas Managing Director	(212) 272-4955	jfagas@bear.com

Rating Agency Contacts

Name:	Telephone:	E-Mail:

Rachel Peng Moody’s	(212) 553-3831	rachel.peng@moodys.com

Daniel Hall Standard and Poor’s	(212) 438-1576	Daniel_Hall@standardandpoors.com

		BEAR, STEARNS & CO. INC.
ATLANTA • BOSTON • CHICAGO		ASSET-BACKED SECURITIES GROUP
DALLAS • LOS ANGELES • NEW YORK • SAN FRANCISCO		383 Madison Avenue
FRANKFURT • GENEVA • HONG KONG		New York, N.Y. 10179
LONDON • PARIS • TOKYO		(212) 272-2000

Part II of II

New Issue Computational Materials

$[1,400,003,000] (Approximate)

Impac Secured Assets Corp.,

Pass-Through Certificates, Series 2007-2

Impac Funding Corporation

Seller and Master Servicer

Impac Secured Assets Corp.

Depositor

Ambac Assurance Corporation

Certificate Insurer

March 20, 2007 (Revised March 26, 2007)

		BEAR, STEARNS & CO. INC.
ATLANTA • BOSTON • CHICAGO		ASSET-BACKED SECURITIES GROUP
DALLAS • LOS ANGELES • NEW YORK • SAN FRANCISCO		383 Madison Avenue
FRANKFURT • GENEVA • HONG KONG		New York, N.Y. 10179
LONDON • PARIS • TOKYO		(212) 272-2000

STATEMENT REGARDING FREE WRITING PROSPECTUS

This free writing prospectus does not contain all information that is required to be included in the base prospectus and the prospectus supplement.

The Information in this free writing prospectus is preliminary and is subject to completion or change.

This free writing prospectus is not an offer to sell or solicitation of an offer to buy these securities in any state where such offer, solicitation or sale is not permitted.

		BEAR, STEARNS & CO. INC.
ATLANTA • BOSTON • CHICAGO		ASSET-BACKED SECURITIES GROUP
DALLAS • LOS ANGELES • NEW YORK • SAN FRANCISCO		383 Madison Avenue
FRANKFURT • GENEVA • HONG KONG		New York, N.Y. 10179
LONDON • PARIS • TOKYO		(212) 272-2000

SECURITIES, PRICING ESTIMATES AND OTHER INFORMATION

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 1 of 31

Aggregate Group 1 Mortgage Loans

Summary of Loans in Sample Calculation Pool

(As of Sample Calculation Date)

			Range
Total Number of Loans	3,746
Total Outstanding Balance	$1,195,091,190.24	$19,327.36	to	$2,000,000.00
Average Loan Balance	$319,031.28
WA Mortgage Rate	6.868%	4.875%	to	14.500%
WA Mortgage Rate Net LPMI	6.842%	4.875%	to	14.500%
Net WAC	6.469%	4.485%	to	13.970%
% of Fixed Rate Mortgage Loans	30.22%
% of ARM Loans	69.78%
ARM Characteristics
WA Gross Margin	3.117%	1.875%	to	7.375%
WA Months to First Roll	58	5	to	85
WA Initial Rate Cap	3.258%	1.000%	to	6.000%
WA Subsequent Rate Cap	1.101%	1.000%	to	2.000%
WA Lifetime Cap	12.733%	9.950%	to	18.875%
WA Lifetime Floor	3.222%	1.875%	to	12.250%
WA Original Term (months)	354	180	to	360
WA Remaining Term (months)	353	171	to	360
WA Age (months)	1	0	to	12
WA LTV*	73.08%	8.86%	to	100.00%
WA FICO	705	593	to	831
WA DTI%	39.37%	2.23%	to	55.00%
Secured by (% of pool)
1^st Liens	97.49%
2^nd Liens	2.51%
Prepayment Penalty at Loan Origination (% of all loans)	64.67%
Prepay Moves Exempted
Soft	8.37%
Hard	56.30%
No Prepay	35.33%
% Interest Only	72.19%
WA Interest Only Term (months)	87
% Silent Seconds	49.33%
% Loans LTV* Greater than 80.00%	6.06%
% Loans LTV* Greater than 80.00% that have MI	58.39%


Top 5 States (%)		Top 5 Prop Types (%)		Top 5 Doc Types (%)		Purpose Codes (%)		Occ Codes (%)		Orig PP Term (%)
CA	56.81	SFR	62.05	Stated	66.49	PUR	40.33	OO	79.11	36	38.51
FL	10.48	D-PUDS	10.02	Full	15.82	REFI/CO	37.95	NOO	17.56	None	35.33
NY	7.18	CONDO	8.58	Exp VA	6.21	REFI/RT	21.72	2^nd HM	3.32	12	16.12
HI	2.91	2-FAMILY	6.04	SISA	5.72					24	9.25
NJ	2.81	PUD	4.26	Exp ND	2.73					6	0.46
										60	0.33

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 2 of 31

Aggregate Group 1 Mortgage Loans

Description
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
15YR FIXED		11,340,086.91		44		0.95		257,729.25		6.209		179		727		60.54
15YR FIXED IO		274,550.00		4		0.02		68,637.50		11.173		180		714		96.43
2/6 LIBOR		2,815,402.88		15		0.24		187,693.53		8.645		359		670		79.05
2/6 LIBOR 40/30 BALLOON		1,259,103.17		5		0.11		251,820.63		7.019		359		654		73.03
2/6 LIBOR IO		5,557,811.00		16		0.47		347,363.19		7.327		358		686		77.02
20YR FIXED		1,710,046.40		5		0.14		342,009.28		6.008		239		736		53.32
25YR FIXED		375,990.38		1		0.03		375,990.38		6.500		298		694		57.12
3/1 LIBOR		115,606.81		1		0.01		115,606.81		6.875		356		622		58.00
3/6 LIBOR		3,758,106.31		11		0.31		341,646.03		6.190		359		713		67.66
3/6 LIBOR 40/30 BALLOON		2,282,365.36		9		0.19		253,596.15		6.823		358		692		73.30
3/6 LIBOR IO		52,198,684.00		123		4.37		424,379.54		6.237		359		710		71.26
30/15 FIXED BALLOON		26,872,046.66		332		2.25		80,939.90		11.545		179		721		96.36
30/15 FIXED BALLOON IO		1,617,827.49		22		0.14		73,537.61		11.704		179		723		96.81
30YR FIXED		167,090,511.16		542		13.98		308,285.08		6.554		359		714		67.14
30YR FIXED IO		131,634,650.00		378		11.01		348,239.81		6.581		359		716		68.73
40/30 FIXED BALLOON		20,263,695.38		59		1.70		343,452.46		6.668		359		704		73.15
5/1 LIBOR		2,721,516.89		6		0.23		453,586.15		6.364		356		711		61.79
5/1 LIBOR IO		56,991,630.00		145		4.77		393,045.72		6.644		358		716		75.29
5/6 LIBOR		67,226,292.04		242		5.63		277,794.60		7.257		359		691		75.78
5/6 LIBOR 40/30 BALLOON		20,866,927.10		60		1.75		347,782.12		7.245		359		663		75.54
5/6 LIBOR IO		587,749,572.05		1,652		49.18		355,780.61		6.847		359		700		74.90
6M LIBOR		319,850.70		1		0.03		319,850.70		9.750		359		686		80.00
6M LIBOR IO		157,500.00		1		0.01		157,500.00		6.015		360		731		75.00
7/1 LIBOR		2,115,130.80		2		0.18		1,057,565.40		6.250		357		673		66.86
7/1 LIBOR IO		1,340,000.00		3		0.11		446,666.67		6.011		357		791		51.52
7/6 LIBOR		1,277,916.75		2		0.11		638,958.38		5.953		358		744		35.07
7/6 LIBOR IO		25,158,370.00		65		2.11		387,051.85		6.525		359		717		66.99
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 3 of 31

Aggregate Group 1 Mortgage Loans

Range of Current Balance
Description ($)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
0.01 - 250,000.00		235,818,206.17		1,576		19.73		149,630.84		7.516		335		698		74.38
250,000.01 - 300,000.00		114,053,953.48		413		9.54		276,159.69		6.767		357		698		72.45
300,000.01 - 350,000.00		106,939,576.60		327		8.95		327,032.34		6.729		356		702		73.48
350,000.01 - 400,000.00		117,961,458.78		314		9.87		375,673.44		6.726		357		700		74.41
400,000.01 - 450,000.00		119,807,776.18		281		10.02		426,362.19		6.608		359		706		74.15
450,000.01 - 500,000.00		128,307,667.17		268		10.74		478,759.95		6.626		358		711		74.27
500,000.01 - 550,000.00		94,794,241.66		180		7.93		526,634.68		6.759		359		709		73.92
550,000.01 - 600,000.00		69,302,748.69		120		5.80		577,522.91		6.869		357		708		73.54
600,000.01 - 650,000.00		60,942,131.23		97		5.10		628,269.39		6.696		356		712		69.38
650,000.01 - 700,000.00		25,747,438.07		38		2.15		677,564.16		6.790		354		713		72.31
700,000.01 - 750,000.00		36,180,624.64		49		3.03		738,380.09		6.753		359		707		70.02
750,000.01 - 800,000.00		9,416,570.86		12		0.79		784,714.24		6.680		359		716		65.61
800,000.01 - 850,000.00		9,099,863.24		11		0.76		827,260.29		6.270		359		708		67.73
850,000.01 - 900,000.00		7,984,239.25		9		0.67		887,137.69		6.679		339		720		70.68
900,000.01 - 950,000.00		4,618,105.81		5		0.39		923,621.16		6.470		359		697		69.38
950,000.01 - 1,000,000.00		22,694,470.95		23		1.90		986,716.13		6.659		351		707		69.59
1,000,000.01 - 1,050,000.00		2,100,000.00		2		0.18		1,050,000.00		7.125		358		702		75.00
1,050,000.01 - 1,150,000.00		4,370,785.78		4		0.37		1,092,696.45		6.779		360		734		62.66
1,150,000.01 - 1,200,000.00		2,356,381.87		2		0.20		1,178,190.94		6.442		358		737		56.43
1,200,000.01 - 1,300,000.00		6,281,881.81		5		0.53		1,256,376.36		6.355		359		730		60.56
1,300,000.01 - 1,400,000.00		1,391,250.00		1		0.12		1,391,250.00		6.875		360		696		75.00
1,400,000.01 - 1,450,000.00		1,413,943.00		1		0.12		1,413,943.00		6.250		357		665		60.34
1,450,000.01 - 1,750,000.00		7,779,375.00		5		0.65		1,555,875.00		7.213		359		727		71.89
1,800,000.01 +		5,728,500.00		3		0.48		1,909,500.00		6.247		360		744		64.02
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 4 of 31

Aggregate Group 1 Mortgage Loans

Range of Original Balance
Description ($)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
0.01 - 250,000.00		235,818,206.17		1,576		19.73		149,630.84		7.516		335		698		74.38
250,000.01 - 300,000.00		114,053,953.48		413		9.54		276,159.69		6.767		357		698		72.45
300,000.01 - 350,000.00		106,939,576.60		327		8.95		327,032.34		6.729		356		702		73.48
350,000.01 - 400,000.00		117,961,458.78		314		9.87		375,673.44		6.726		357		700		74.41
400,000.01 - 450,000.00		119,807,776.18		281		10.02		426,362.19		6.608		359		706		74.15
450,000.01 - 500,000.00		128,307,667.17		268		10.74		478,759.95		6.626		358		711		74.27
500,000.01 - 550,000.00		94,794,241.66		180		7.93		526,634.68		6.759		359		709		73.92
550,000.01 - 600,000.00		69,302,748.69		120		5.80		577,522.91		6.869		357		708		73.54
600,000.01 - 650,000.00		60,942,131.23		97		5.10		628,269.39		6.696		356		712		69.38
650,000.01 - 700,000.00		25,047,800.93		37		2.10		676,967.59		6.805		359		712		72.27
700,000.01 - 750,000.00		36,880,261.78		50		3.09		737,605.24		6.743		356		708		70.10
750,000.01 - 800,000.00		9,416,570.86		12		0.79		784,714.24		6.680		359		716		65.61
800,000.01 - 850,000.00		9,099,863.24		11		0.76		827,260.29		6.270		359		708		67.73
850,000.01 - 900,000.00		7,984,239.25		9		0.67		887,137.69		6.679		339		720		70.68
900,000.01 - 950,000.00		4,618,105.81		5		0.39		923,621.16		6.470		359		697		69.38
950,000.01 - 1,000,000.00		22,694,470.95		23		1.90		986,716.13		6.659		351		707		69.59
1,000,000.01 - 1,050,000.00		2,100,000.00		2		0.18		1,050,000.00		7.125		358		702		75.00
1,050,000.01 - 1,150,000.00		4,370,785.78		4		0.37		1,092,696.45		6.779		360		734		62.66
1,150,000.01 - 1,200,000.00		2,356,381.87		2		0.20		1,178,190.94		6.442		358		737		56.43
1,200,000.01 - 1,300,000.00		6,281,881.81		5		0.53		1,256,376.36		6.355		359		730		60.56
1,300,000.01 - 1,400,000.00		1,391,250.00		1		0.12		1,391,250.00		6.875		360		696		75.00
1,400,000.01 - 1,450,000.00		1,413,943.00		1		0.12		1,413,943.00		6.250		357		665		60.34
1,450,000.01 - 1,750,000.00		7,779,375.00		5		0.65		1,555,875.00		7.213		359		727		71.89
1,800,000.01 +		5,728,500.00		3		0.48		1,909,500.00		6.247		360		744		64.02
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 5 of 31

Aggregate Group 1 Mortgage Loans

State
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
California		678,978,341.19		1,875		56.81		362,121.78		6.623		353		712		72.00
Florida		125,254,501.78		566		10.48		221,297.71		7.495		351		690		76.23
New York		85,834,491.44		205		7.18		418,704.84		7.285		351		698		73.24
Hawaii		34,743,011.52		96		2.91		361,906.37		6.839		351		689		74.62
New Jersey		33,525,916.37		105		2.81		319,294.44		7.302		357		681		74.87
Illinois		32,531,224.62		133		2.72		244,595.67		7.421		353		694		73.14
Arizona		31,750,843.27		116		2.66		273,714.17		6.937		356		697		73.74
Maryland		24,196,729.86		71		2.02		340,799.01		7.047		354		689		76.04
Nevada		23,891,199.70		87		2.00		274,611.49		6.836		356		702		72.74
Virginia		23,161,819.42		87		1.94		266,227.81		7.042		352		689		76.29
Other**		101,223,111.07		405		8.47		249,933.61		6.970		354		707		73.58
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

** All States with loan concentrations less than 1.94% of the total balance were placed in the other category.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 6 of 31

Aggregate Group 1 Mortgage Loans

Loan-to-Value* Ratios
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
0.00 - 10.00		350,000.00		1		0.03		350,000.00		5.190		359		750		8.86
10.01 - 15.00		167,716.73		3		0.01		55,905.58		7.255		358		729		12.08
15.01 - 20.00		592,080.24		3		0.05		197,360.08		6.994		286		742		19.51
20.01 - 25.00		3,271,806.83		14		0.27		233,700.49		6.140		352		746		22.56
25.01 - 30.00		4,947,300.14		19		0.41		260,384.22		6.200		354		769		27.55
30.01 - 35.00		6,466,826.22		25		0.54		258,673.05		6.048		348		735		33.22
35.01 - 40.00		13,250,798.45		36		1.11		368,077.73		6.176		347		741		37.68
40.01 - 45.00		11,573,815.43		39		0.97		296,764.50		6.282		357		725		42.75
45.01 - 50.00		26,839,303.86		94		2.25		285,524.51		6.206		347		718		47.96
50.01 - 55.00		39,060,706.79		118		3.27		331,022.94		6.223		357		716		52.89
55.01 - 60.00		58,166,506.84		157		4.87		370,487.30		6.220		354		719		57.89
60.01 - 65.00		58,462,847.64		150		4.89		389,752.32		6.281		354		715		63.13
65.01 - 70.00		149,040,257.44		423		12.47		352,341.03		6.522		356		713		69.03
70.01 - 75.00		247,347,113.11		711		20.70		347,886.24		6.885		358		698		74.50
75.01 - 80.00		503,125,095.74		1,418		42.10		354,813.18		6.892		359		699		79.71
80.01 - 85.00		16,038,478.29		59		1.34		271,838.62		7.426		353		690		84.52
85.01 - 90.00		23,676,455.07		159		1.98		148,908.52		8.701		330		697		89.54
90.01 - 95.00		14,610,781.53		128		1.22		114,146.73		9.681		281		720		94.80
95.01 +		18,103,299.89		189		1.51		95,784.66		11.485		187		709		99.96
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 7 of 31

Aggregate Group 1 Mortgage Loans

Current Mortgage Rate
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
4.500 - 4.999		320,605.30		1		0.03		320,605.30		4.875		359		778		56.32
5.000 - 5.499		15,003,380.65		41		1.26		365,936.11		5.291		356		740		60.70
5.500 - 5.999		168,200,416.74		425		14.07		395,765.69		5.804		354		736		66.32
6.000 - 6.499		268,676,262.34		733		22.48		366,543.33		6.234		356		720		69.02
6.500 - 6.999		356,953,219.17		1,047		29.87		340,929.53		6.711		358		698		73.67
7.000 - 7.499		161,910,593.47		500		13.55		323,821.19		7.200		358		686		76.07
7.500 - 7.999		116,136,813.37		359		9.72		323,500.87		7.681		359		683		77.19
8.000 - 8.499		37,684,758.55		117		3.15		322,091.95		8.176		359		686		78.39
8.500 - 8.999		22,123,479.46		76		1.85		291,098.41		8.694		359		672		80.97
9.000 - 9.499		8,359,258.97		29		0.70		288,250.31		9.145		356		669		80.68
9.500 - 9.999		8,678,382.96		43		0.73		201,822.86		9.703		319		686		84.88
10.000 - 10.499		3,162,527.98		31		0.26		102,017.03		10.285		236		712		96.06
10.500 - 10.999		6,791,424.37		71		0.57		95,653.86		10.749		218		719		96.26
11.000 - 11.499		4,518,755.21		54		0.38		83,680.65		11.224		199		715		95.36
11.500 - 11.999		5,971,846.47		85		0.50		70,257.02		11.771		192		721		95.41
12.000 - 12.499		4,662,397.56		65		0.39		71,729.19		12.242		183		699		94.60
12.500 - 12.999		3,419,274.07		45		0.29		75,983.87		12.695		217		694		95.74
13.000 - 13.499		1,102,173.99		12		0.09		91,847.83		13.133		179		709		97.45
13.500 - 13.999		1,239,505.02		10		0.10		123,950.50		13.686		203		686		99.40
14.000 - 14.499		50,564.59		1		0.00		50,564.59		14.250		176		785		98.73
14.500 - 14.999		125,550.00		1		0.01		125,550.00		14.500		180		720		90.00
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 8 of 31

Aggregate Group 1 Mortgage Loans

Property Type
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
2-FAMILY		72,175,790.35		218		6.04		331,081.61		7.211		354		704		74.64
3-FAMILY		39,715,763.86		94		3.32		422,508.13		7.691		356		703		73.09
4-FAMILY		28,272,238.62		63		2.37		448,765.69		7.569		351		715		71.11
CONDO		102,486,074.50		454		8.58		225,740.25		7.067		349		702		76.24
CONDONONWA		294,000.00		1		0.02		294,000.00		6.500		358		685		70.00
CONDOTEL		4,628,139.10		12		0.39		385,678.26		7.574		359		712		75.77
D-PUDS		119,759,336.49		329		10.02		364,010.14		6.753		352		706		72.13
HI-RISE		29,729,298.68		97		2.49		306,487.62		7.525		351		700		74.59
PUD		50,875,103.87		164		4.26		310,214.05		6.716		355		710		72.72
SFR		741,553,165.26		2,290		62.05		323,822.34		6.732		353		705		72.63
TOWNHOUSE		5,602,279.51		24		0.47		233,428.31		7.105		357		671		78.09
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 9 of 31

Aggregate Group 1 Mortgage Loans

Purpose
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
Cash Out Refinance		453,588,574.67		1,388		37.95		326,792.92		6.690		355		701		69.09
Purchase		481,978,999.43		1,649		40.33		292,285.63		7.261		350		706		78.04
Rate/Term Refinance		259,523,616.14		709		21.72		366,041.77		6.448		355		710		70.84
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

Aggregate Group 1 Mortgage Loans

Occupancy
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
Investor		209,908,696.04		874		17.56		240,170.13		7.228		353		714		72.06
Owner Occupied		945,456,779.46		2,724		79.11		347,083.99		6.773		353		703		73.27
Second Home		39,725,714.74		148		3.32		268,416.99		7.212		346		709		73.88
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 10 of 31

Aggregate Group 1 Mortgage Loans

Range of Months Remaining to Scheduled Maturity
Description (months)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
121 - 180		40,104,511.06		402		3.36		99,762.47		10.040		179		722		86.25
181 - 240		1,710,046.40		5		0.14		342,009.28		6.008		239		736		53.32
241 - 360		1,153,276,632.78		3,339		96.50		345,395.82		6.759		359		704		72.65
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

Aggregate Group 1 Mortgage Loans

Collateral Grouped by Document Type
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
Alternative		2,580,768.10		6		0.22		430,128.02		6.810		358		697		76.86
Express No Doc		32,638,121.73		122		2.73		267,525.59		6.821		354		711		65.29
Express No Doc Verified Assets		3,227,544.67		9		0.27		358,616.07		6.653		358		732		75.17
Express Non-Verified Assets		29,762,585.48		98		2.49		303,699.85		7.031		356		694		69.88
Express Verified Assets		74,246,001.31		208		6.21		356,951.93		6.957		356		691		71.67
FISA		601,900.00		5		0.05		120,380.00		7.067		360		729		53.88
Full		189,048,793.00		535		15.82		353,362.23		6.235		356		724		68.72
SISA		68,360,615.87		227		5.72		301,148.09		6.871		355		703		72.22
Stated		794,624,860.08		2,536		66.49		313,337.88		7.006		352		702		74.76
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 11 of 31

Aggregate Group 1 Mortgage Loans

Collateral Grouped by FICO
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
581 - 600		1,685,105.98		4		0.14		421,276.50		6.957		359		599		72.33
601 - 620		22,679,813.10		83		1.90		273,250.76		7.455		358		614		67.72
621 - 640		75,347,342.52		230		6.30		327,597.14		7.157		357		632		74.08
641 - 660		143,683,887.64		479		12.02		299,966.36		7.214		355		651		75.92
661 - 680		165,102,227.30		539		13.82		306,312.11		7.224		353		670		75.68
681 - 700		197,116,706.42		597		16.49		330,178.74		6.772		355		691		74.33
701 - 720		152,597,243.62		477		12.77		319,910.36		6.777		355		710		73.65
721 - 740		132,101,392.53		421		11.05		313,780.03		6.746		349		730		72.85
741 - 760		113,571,702.42		372		9.50		305,300.28		6.665		348		750		71.99
761 - 780		92,833,857.75		284		7.77		326,879.78		6.591		348		771		69.76
781 - 800		70,320,011.31		183		5.88		384,262.36		6.384		356		790		66.21
801 +		24,076,564.69		65		2.01		370,408.69		6.242		349		807		66.41
N/A**		3,975,334.96		12		0.33		331,277.91		7.493		359		N/A		68.71
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

**Primary Borrower is a Foreign National and therefore, has no fico score.

Aggregate Group 1 Mortgage Loans

Collateral Grouped by Prepayment Penalty Term
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
No Prepay		422,243,338.70		1,316		35.33		320,853.60		7.032		352		709		72.79
6 Month		5,477,365.28		17		0.46		322,197.96		7.095		349		714		70.00
1 Year		192,628,366.66		552		16.12		348,964.43		6.900		354		703		73.31
2 Year		110,545,238.92		402		9.25		274,988.16		7.111		349		693		75.82
3 Year		460,282,024.42		1,444		38.51		318,754.86		6.639		354		704		72.66
5 Year		3,914,856.26		15		0.33		260,990.42		7.187		359		698		69.18
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 12 of 31

Aggregate Group 1 Mortgage Loans

Range of Months to First Roll
Description (months)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
FIXED		361,179,404.38		1,387		30.22		260,403.32		6.954		338		715		70.10
0.01 - 12.99		477,350.70		2		0.04		238,675.35		8.518		359		701		78.35
13.00 - 24.99		9,364,317.05		35		0.78		267,551.92		7.677		358		677		77.01
25.00 - 31.99		268,000.00		1		0.02		268,000.00		7.500		360		692		80.00
32.00 - 49.99		58,845,397.88		146		4.92		403,050.67		6.266		359		710		71.16
50.00 - 55.99		1,213,029.95		3		0.10		404,343.32		6.721		354		719		77.07
56.00 - 79.99		733,852,272.73		2,100		61.41		349,453.46		6.878		359		699		74.97
80.00 +		29,891,417.55		72		2.50		415,158.58		6.458		359		718		64.92
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

Aggregate Group 1 Mortgage Loans

Range of Gross Margin
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
FIXED		361,179,404.38		1,387		30.22		260,403.32		6.954		338		715		70.10
1.750 - 2.249		1,186,187.80		2		0.10		593,093.90		6.250		357		725		78.52
2.250 - 2.499		22,361,565.77		47		1.87		475,778.00		6.367		357		714		69.87
2.500 - 2.749		12,713,156.77		45		1.06		282,514.59		6.679		359		713		72.16
2.750 - 2.999		59,936,985.24		171		5.02		350,508.69		6.873		358		700		74.69
3.000 - 3.249		565,097,162.82		1,588		47.28		355,854.64		6.793		359		701		73.64
3.250 - 3.499		51,469,574.55		135		4.31		381,256.11		6.744		358		709		75.53
3.500 - 3.749		16,349,090.45		50		1.37		326,981.81		7.322		359		701		82.17
3.750 - 3.999		67,430,969.10		202		5.64		333,816.68		6.880		360		698		76.79
4.000 - 4.249		24,064,209.86		71		2.01		338,932.53		7.174		359		679		77.37
4.250 - 4.499		2,845,659.55		11		0.24		258,696.32		9.880		360		634		86.42
4.500 - 4.749		2,050,499.21		10		0.17		205,049.92		7.898		359		679		80.90
4.750 - 4.999		811,900.00		2		0.07		405,950.00		7.886		359		673		86.96
5.000 - 5.249		1,068,000.00		3		0.09		356,000.00		7.116		357		664		80.00
5.250 - 5.499		511,600.00		1		0.04		511,600.00		7.500		358		643		80.00
5.500 - 5.749		1,122,107.53		5		0.09		224,421.51		7.449		360		674		79.42
5.750 - 5.999		1,215,220.00		3		0.10		405,073.33		6.214		359		712		77.93
6.000 - 6.249		528,000.00		2		0.04		264,000.00		7.655		359		675		80.00
6.250 - 6.499		537,697.97		3		0.04		179,232.66		7.345		357		663		77.66
6.500 - 6.749		1,132,945.02		4		0.09		283,236.26		7.652		356		699		82.70
6.750 - 6.999		181,742.25		1		0.02		181,742.25		7.750		358		661		70.00
7.000 - 7.249		797,511.97		2		0.07		398,755.99		9.032		359		628		80.00
7.250 - 7.499		500,000.00		1		0.04		500,000.00		7.375		360		682		80.00
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 13 of 31

Aggregate Group 1 Mortgage Loans

Range of Lifetime Caps
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
FIXED		361,179,404.38		1,387		30.22		260,403.32		6.954		338		715		70.10
9.500 - 9.999		500,000.00		1		0.04		500,000.00		7.375		359		658		76.92
10.000 - 10.499		212,000.00		1		0.02		212,000.00		5.250		359		735		80.00
10.500 - 10.999		5,939,629.95		15		0.50		395,975.33		5.772		357		733		63.83
11.000 - 11.499		27,156,472.95		69		2.27		393,572.07		5.913		358		724		67.47
11.500 - 11.999		138,032,945.50		345		11.55		400,095.49		6.015		359		728		70.31
12.000 - 12.499		156,481,551.78		419		13.09		373,464.32		6.318		359		711		71.86
12.500 - 12.999		234,568,224.76		671		19.63		349,580.07		6.747		359		694		75.53
13.000 - 13.499		118,014,879.41		357		9.87		330,573.89		7.222		359		687		76.48
13.500 - 13.999		88,908,746.52		271		7.44		328,076.56		7.691		359		682		77.79
14.000 - 14.499		30,734,132.34		91		2.57		337,737.72		8.208		359		680		78.18
14.500 - 14.999		17,425,451.62		58		1.46		300,438.82		8.717		359		673		81.36
15.000 - 15.499		7,354,605.30		23		0.62		319,765.45		9.142		359		669		80.83
15.500 - 15.999		5,714,117.22		22		0.48		259,732.60		9.683		359		664		83.35
16.000 - 16.499		793,391.86		4		0.07		198,347.97		10.199		359		641		89.27
16.500 - 16.999		1,275,012.82		7		0.11		182,144.69		10.779		360		639		87.22
17.000 - 17.499		271,737.33		2		0.02		135,868.67		11.388		359		667		90.00
17.500 - 17.999		158,950.00		1		0.01		158,950.00		11.500		359		634		89.98
18.000 - 18.499		100,000.00		1		0.01		100,000.00		12.250		360		658		81.30
18.500 - 18.999		269,936.50		1		0.02		269,936.50		12.875		359		632		87.10
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 14 of 31

Aggregate Group 1 Mortgage Loans

Next Interest Adjustment Date
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
FIXED		361,179,404.38		1,387		30.22		260,403.32		6.954		338		715		70.10
August 2007		319,850.70		1		0.03		319,850.70		9.750		359		686		80.00
October 2007		157,500.00		1		0.01		157,500.00		6.015		360		731		75.00
December 2008		2,746,704.52		6		0.23		457,784.09		6.843		357		676		73.99
January 2009		1,852,968.81		10		0.16		185,296.88		8.184		358		664		80.05
February 2009		2,429,333.72		11		0.20		220,848.52		8.437		359		680		75.96
March 2009		2,335,310.00		8		0.20		291,913.75		7.465		360		683		79.24
April 2009		268,000.00		1		0.02		268,000.00		7.500		360		692		80.00
November 2009		115,606.81		1		0.01		115,606.81		6.875		356		622		58.00
December 2009		4,870,494.84		17		0.41		286,499.70		7.047		357		664		74.33
January 2010		3,415,870.00		12		0.29		284,655.83		6.504		358		716		74.63
February 2010		17,934,841.83		43		1.50		417,089.34		6.210		359		707		70.62
March 2010		27,695,449.00		61		2.32		454,023.75		6.079		360		724		69.16
April 2010		4,322,500.00		10		0.36		432,250.00		6.504		360		680		79.19
March 2011		490,635.40		2		0.04		245,317.70		7.195		348		693		80.64
June 2011		172,500.00		1		0.01		172,500.00		8.250		351		654		75.00
September 2011		539,250.00		1		0.05		539,250.00		7.250		354		724		75.00
October 2011		501,279.95		1		0.04		501,279.95		5.625		355		735		80.00
November 2011		3,928,304.84		11		0.33		357,118.62		7.069		356		702		66.40
December 2011		33,467,895.20		93		2.80		359,869.84		7.001		357		692		76.77
January 2012		129,298,004.34		373		10.82		346,643.44		6.787		358		703		74.33
February 2012		253,110,170.35		732		21.18		345,778.92		6.939		359		699		74.52
March 2012		264,933,353.00		752		22.17		352,304.99		6.851		360		699		75.41
April 2012		49,114,545.00		139		4.11		353,342.05		6.855		360		696		76.04
November 2013		485,000.00		1		0.04		485,000.00		6.250		356		776		76.38
December 2013		2,693,130.80		4		0.23		673,282.70		6.182		357		687		62.64
January 2014		6,509,154.19		17		0.54		382,891.42		6.538		358		712		62.85
February 2014		8,875,132.56		23		0.74		385,875.33		6.560		359		725		67.63
March 2014		10,873,000.00		26		0.91		418,192.31		6.407		360		720		64.55
April 2014		456,000.00		1		0.04		456,000.00		6.400		360		750		52.05
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 15 of 31

Aggregate Group 1 Mortgage Loans

Initial Fixed Period
Description (months)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
FIXED		361,179,404.38		1,387		30.22		260,403.32		6.954		338		715		70.10
6		477,350.70		2		0.04		238,675.35		8.518		359		701		78.35
24		9,632,317.05		36		0.81		267,564.36		7.672		359		677		77.09
36		58,354,762.48		144		4.88		405,241.41		6.258		359		710		71.09
60		735,555,938.08		2,105		61.55		349,432.75		6.878		359		699		74.98
84		29,891,417.55		72		2.50		415,158.58		6.458		359		718		64.92
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

Aggregate Group 1 Mortgage Loans

Initial Rate Cap
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
FIXED		361,179,404.38		1,387		30.22		260,403.32		6.954		338		715		70.10
1.000		477,350.70		2		0.04		238,675.35		8.518		359		701		78.35
2.000		1,069,356.81		4		0.09		267,339.20		6.812		357		672		75.78
3.000		733,876,493.45		2,088		61.41		351,473.42		6.828		359		700		74.30
5.000		78,345,234.47		200		6.56		391,726.17		6.751		358		710		74.56
6.000		20,143,350.43		65		1.69		309,897.70		7.183		357		669		75.88
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 16 of 31

Aggregate Group 1 Mortgage Loans

Subsequent Rate Cap
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
FIXED		361,179,404.38		1,387		30.22		260,403.32		6.954		338		715		70.10
1.000		750,054,200.93		2,134		62.76		351,478.07		6.841		359		700		74.37
2.000		83,857,584.93		225		7.02		372,700.38		6.733		358		704		74.40
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

Aggregate Group 1 Mortgage Loans

Range of DTI
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		*Orig. LTV (%)**
0.01 - 5.00		801,750.00		2		0.07		400,875.00		6.611		360		717		77.54
5.01 - 10.00		553,224.00		2		0.05		276,612.00		6.203		360		788		80.00
10.01 - 15.00		8,215,009.44		32		0.69		256,719.05		6.709		352		704		66.33
15.01 - 20.00		20,689,041.45		63		1.73		328,397.48		6.515		358		726		66.80
20.01 - 25.00		34,500,110.79		122		2.89		282,787.79		6.711		353		714		68.37
25.01 - 30.00		65,325,855.45		216		5.47		302,434.52		6.685		351		717		69.49
30.01 - 35.00		110,621,234.87		370		9.26		298,976.31		6.715		355		709		70.63
35.01 - 40.00		242,743,123.18		769		20.31		315,660.76		6.820		351		708		73.64
40.01 - 45.00		346,969,989.21		1,041		29.03		333,304.50		6.874		352		705		74.82
45.01 - 50.00		205,809,795.23		648		17.22		317,607.71		7.124		352		698		76.37
50.01 - 55.00		15,368,620.62		40		1.29		384,215.52		6.520		358		693		68.93
N/A**		143,493,436.00		441		12.01		325,381.94		6.906		356		697		69.55
TOTAL		1,195,091,190.24		3,746		100.00		319,031.28		6.868		353		705		73.08

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

**Primary Borrower did not disclose monthly income on their mortgage loan application and therefore their DTI ratio is not calculated.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 17 of 31

Aggregate Group 2 Mortgage Loans

Summary of Loans in Sample Calculation Pool

(As of Sample Calculation Date)

			Range
Total Number of Loans	195
Total Outstanding Balance	$ 235,270,813.09	$261,442.58	to	$6,200,000.00
Average Loan Balance	$ 1,206,516.99
WA Mortgage Rate	6.434%	5.925%	to	8.500%
WA Mortgage Rate Net LPMI	6.434%	5.925%	to	8.500%
Net WAC	6.154%	5.645%	to	8.220 %
% of Fixed Rate Mortgage Loans	1.16%
% of ARM Loans	98.84%
ARM Characteristics
WA Gross Margin	2.621%	2.350%	to	3.750%
WA Months to First Roll	81	33	to	121
WA Initial Rate Cap	3.000%	3.000%	to	3.000%
WA Subsequent Rate Cap	1.045%	1.000%	to	3.000%
WA Lifetime Cap	12.431%	11.925%	to	14.500%
WA Lifetime Floor	6.417%	2.500%	to	8.500%
WA Original Term (months)	336	120	to	360
WA Remaining Term (months)	334	117	to	360
WA Age (months)	2	0	to	4
WA LTV*	65.15%	24.01%	to	80.00%
WA FICO	736	632	to	812
WA DTI%	6.22%	0.35%	to	28.72%
Secured by (% of pool)
1^st Liens	100.00%
Prepayment Penalty at Loan Origination (% of all loans)	100.00%
Prepay Moves Exempted
Soft	0.00%
Hard	100.00%
No Prepay	0.00%
% Interest Only	17.69%
WA Interest Only Term (months)	55
% Silent Seconds	0.00%
% Loans LTV* Greater than 80.00%	0.00%
% Loans LTV* Greater than 80.00% that have MI	0.00%


Top 5 States (%)		Top 5 Prop Types (%)		Top 5 Doc Types (%)		Purpose Codes (%)		Occ Codes (%)		Orig PP Term (%)
CA	59.46	MultiFam	87.11	-Full	96.03	REFI/CO	59.55	NOO	99.85	60	50.31
WA	5.84	C-RETAIL	5.08	Stated	3.42	PUR	35.53	OO	0.15	120	37.24
OR	4.67	C-OFFICE	2.93	SISA	0.54	REFI/RT	4.92			84	7.93
AZ	4.08	C-SELF_STG	2.64							36	4.52
TX	3.97	C-MBLE_HM	1.22							None	0.00

*Combined loan-to-value ratios with respect to the statistical mortgaged loans secured by second liens.

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 18 of 31

Aggregate Group 2 Mortgage Loans

Summary of Loans in Sample Calculation Pool

(As of Sample Calculation Date)

			Range
Total Number of Loans	195
Total Outstanding Balance	$ 234,949,001.15	$260,969.69	to	$6,186,598.42
Average Loan Balance	$ 1,204,866.67
WA Mortgage Rate	6.434%	5.925%	to	8.500%
WA Mortgage Rate Net LPMI	6.434%	5.925%	to	8.500%
Net WAC	6.154%	5.645%	to	8.220 %
% of Fixed Rate Mortgage Loans	1.16%
% of ARM Loans	98.84%
ARM Characteristics
WA Gross Margin	2.621%	2.350%	to	3.750%
WA Months to First Roll	81	33	to	121
WA Initial Rate Cap	3.000%	3.000%	to	3.000%
WA Subsequent Rate Cap	1.045%	1.000%	to	3.000%
WA Lifetime Cap	12.431%	11.925%	to	14.500%
WA Lifetime Floor	6.417%	2.500%	to	8.500%
WA Original Term (months)	336	120	to	360
WA Remaining Term (months)	334	117	to	360
WA Age (months)	2	0	to	4
WA LTV	65.15%	24.01%	to	80.00%
WA FICO	736	632	to	812
Secured by (% of pool)
1^st Liens	100.00%
Prepayment Penalty at Loan Origination (% of all loans)	100.00%
Prepay Moves Exempted
Soft	0.00%
Hard	100.00%
No Prepay	0.00%
% Interest Only	17.71%
WA Interest Only Term (months)	55
% Silent Seconds	0.00%
% Loans LTV Greater than 80.00%	0.00%
% Loans LTV Greater than 80.00% that have MI	0.00%


Top 5 States (%)		Top 5 Prop Types (%)		Top 5 Doc Types (%)		Purpose Codes (%)		Occ Codes (%)		Orig PP Term (%)
CA	59.47	MultiFam	87.13	-Full	96.03100.00	REFI/CO	59.56	NOO	99.85	60	50.34
WA	5.84	C-RETAIL	5.07	Stated	3.42	PUR	35.52	OO	0.15	120	37.21
OR	4.66	C-OFFICE	2.93	SISA	0.54	REFI/RT	4.92			84	7.94
AZ	4.08	C-SELF_STG	2.63							36	4.52
TX	3.96	C-MBLE_HM	1.22							None	0.00

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 19 of 31

Aggregate Group 2 Mortgage Loans

Description
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
10/6 LIBOR		35,645,288.53		34		15.17		1,048,390.84		6.389		358		746		66.85
10/6 LIBOR 10YR BALLOON		2,130,189.79		3		0.91		710,063.26		6.575		358		740		62.68
10/6 LIBOR 15YR BALLOON		25,517,894.64		13		10.86		1,962,914.97		6.450		178		742		61.58
10/6 LIBOR IO		1,587,000.00		1		0.68		1,587,000.00		6.475		357		719		56.68
10/6 MTA		16,621,548.60		21		7.07		791,502.31		6.423		358		754		54.02
10/6 MTA 10YR BALLOON		4,694,943.78		2		2.00		2,347,471.89		6.624		357		741		63.40
25/10 FIXED BALLOON		924,396.12		1		0.39		924,396.12		6.625		118		766		63.93
3/6 LIBOR		6,059,689.42		11		2.58		550,880.86		7.393		358		719		70.01
3/6 LIBOR 10YR BALLOON		2,098,343.36		2		0.89		1,049,171.68		6.467		358		778		71.60
3/6 LIBOR IO		500,000.00		1		0.21		500,000.00		6.450		357		765		55.56
30/10 FIXED BALLOON		1,804,609.87		2		0.77		902,304.94		6.826		117		741		66.55
5/6 LIBOR		29,406,763.24		27		12.52		1,089,139.38		6.708		358		729		71.34
5/6 LIBOR 10YR BALLOON		21,103,867.08		11		8.98		1,918,533.37		6.262		358		734		66.42
5/6 LIBOR 15YR BALLOON		1,994,657.99		1		0.85		1,994,657.99		6.600		177		710		52.63
5/6 LIBOR IO		30,355,500.00		18		12.92		1,686,416.67		6.382		358		746		62.67
5/6 MTA		26,593,449.96		21		11.32		1,266,354.76		6.124		358		717		66.17
5/6 MTA 10YR BALLOON		7,421,327.48		5		3.16		1,484,265.50		6.347		359		719		73.44
5/6 MTA IO		1,840,000.00		2		0.78		920,000.00		6.175		359		725		56.02
7/6 LIBOR		6,348,587.04		8		2.70		793,573.38		6.711		358		750		71.40
7/6 LIBOR 10YR BALLOON		1,410,757.34		2		0.60		705,378.67		6.638		359		742		61.70
7/6 MTA		3,061,829.61		3		1.30		1,020,609.87		6.218		359		722		68.67
7/6 MTA 10YR BALLOON		499,217.58		1		0.21		499,217.58		6.350		358		808		67.57
7/6 MTA IO		7,329,139.72		5		3.12		1,465,827.94		6.205		357		682		61.74
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 20 of 31

Aggregate Group 2 Mortgage Loans

Range of Current Balance
Description ($)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
250,000.01 - 300,000.00		540,295.05		2		0.23		270,147.53		7.125		357		688		80.00
300,000.01 - 350,000.00		1,027,182.81		3		0.44		342,394.27		7.426		358		725		56.43
350,000.01 - 400,000.00		768,727.07		2		0.33		384,363.54		7.700		358		741		63.70
400,000.01 - 450,000.00		2,638,783.90		6		1.12		439,797.32		7.445		358		720		64.61
450,000.01 - 500,000.00		5,359,927.76		11		2.28		487,266.16		6.634		358		749		63.31
500,000.01 - 550,000.00		5,253,707.94		10		2.24		525,370.79		6.752		358		728		58.83
550,000.01 - 600,000.00		7,639,473.97		13		3.25		587,651.84		6.412		358		732		59.58
600,000.01 - 650,000.00		4,976,598.55		8		2.12		622,074.82		6.659		335		725		67.28
650,000.01 - 700,000.00		8,179,869.87		12		3.48		681,655.82		6.476		344		741		63.42
700,000.01 - 750,000.00		10,072,531.70		14		4.29		719,466.55		6.517		341		754		64.98
750,000.01 - 800,000.00		7,809,797.70		10		3.32		780,979.77		6.543		340		749		64.46
800,000.01 - 850,000.00		4,142,786.27		5		1.76		828,557.25		6.318		358		742		59.10
850,000.01 - 900,000.00		8,755,399.30		10		3.73		875,539.93		6.382		340		726		65.65
900,000.01 - 950,000.00		8,376,944.50		9		3.57		930,771.61		6.644		332		748		67.18
950,000.01 - 1,000,000.00		8,813,155.16		9		3.75		979,239.46		6.287		358		736		63.72
1,000,000.01 - 1,050,000.00		4,080,902.73		4		1.74		1,020,225.68		6.356		358		705		65.23
1,050,000.01 - 1,150,000.00		5,507,808.05		5		2.34		1,101,561.61		6.419		273		744		63.00
1,150,000.01 - 1,200,000.00		3,488,345.03		3		1.48		1,162,781.68		6.342		358		762		71.44
1,200,000.01 - 1,300,000.00		6,288,781.58		5		2.68		1,257,756.32		6.469		358		738		67.54
1,300,000.01 - 1,400,000.00		1,396,314.85		1		0.59		1,396,314.85		6.675		357		797		48.28
1,400,000.01 - 1,450,000.00		1,430,557.63		1		0.61		1,430,557.63		6.475		358		778		72.00
1,450,000.01 - 1,750,000.00		17,795,802.94		11		7.57		1,617,800.27		6.473		326		725		62.22
1,750,000.01 - 1,800,000.00		3,552,868.08		2		1.51		1,776,434.04		6.400		358		776		58.83
1,800,000.01 +		107,052,438.71		39		45.56		2,744,934.33		6.334		324		732		66.82
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 21 of 31

Aggregate Group 2 Mortgage Loans

Range of Original Balance
Description ($)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
250,000.01 - 300,000.00		540,295.05		2		0.23		270,147.53		7.125		357		688		80.00
300,000.01 - 350,000.00		1,027,182.81		3		0.44		342,394.27		7.426		358		725		56.43
350,000.01 - 400,000.00		768,727.07		2		0.33		384,363.54		7.700		358		741		63.70
400,000.01 - 450,000.00		2,638,783.90		6		1.12		439,797.32		7.445		358		720		64.61
450,000.01 - 500,000.00		5,884,927.76		12		2.50		490,410.65		6.600		358		746		62.94
500,000.01 - 550,000.00		4,728,707.94		9		2.01		525,411.99		6.807		358		730		58.79
550,000.01 - 600,000.00		7,639,473.97		13		3.25		587,651.84		6.412		358		732		59.58
600,000.01 - 650,000.00		4,976,598.55		8		2.12		622,074.82		6.659		335		725		67.28
650,000.01 - 700,000.00		7,479,869.87		11		3.18		679,988.17		6.476		342		736		63.74
700,000.01 - 750,000.00		10,772,531.70		15		4.59		718,168.78		6.514		342		757		64.66
750,000.01 - 800,000.00		7,809,797.70		10		3.32		780,979.77		6.543		340		749		64.46
800,000.01 - 850,000.00		4,142,786.27		5		1.76		828,557.25		6.318		358		742		59.10
850,000.01 - 900,000.00		8,755,399.30		10		3.73		875,539.93		6.382		340		726		65.65
900,000.01 - 950,000.00		8,376,944.50		9		3.57		930,771.61		6.644		332		748		67.18
950,000.01 - 1,000,000.00		7,814,096.13		8		3.33		976,762.02		6.334		358		738		62.28
1,000,000.01 - 1,050,000.00		5,079,961.76		5		2.16		1,015,992.35		6.272		358		707		67.15
1,050,000.01 - 1,150,000.00		5,507,808.05		5		2.34		1,101,561.61		6.419		273		744		63.00
1,150,000.01 - 1,200,000.00		3,488,345.03		3		1.48		1,162,781.68		6.342		358		762		71.44
1,200,000.01 - 1,300,000.00		6,288,781.58		5		2.68		1,257,756.32		6.469		358		738		67.54
1,300,000.01 - 1,400,000.00		1,396,314.85		1		0.59		1,396,314.85		6.675		357		797		48.28
1,400,000.01 - 1,450,000.00		1,430,557.63		1		0.61		1,430,557.63		6.475		358		778		72.00
1,450,000.01 - 1,750,000.00		17,795,802.94		11		7.57		1,617,800.27		6.473		326		725		62.22
1,750,000.01 - 1,800,000.00		3,552,868.08		2		1.51		1,776,434.04		6.400		358		776		58.83
1,800,000.01 +		107,052,438.71		39		45.56		2,744,934.33		6.334		324		732		66.82
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 22 of 31

Aggregate Group 2 Mortgage Loans

Geographic Distribution
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
California		139,718,469.97		119		59.47		1,174,104.79		6.347		346		734		62.18
Washington		13,713,801.05		7		5.84		1,959,114.44		6.223		239		751		63.54
Oregon		10,959,676.19		10		4.66		1,095,967.62		6.462		347		754		68.61
Arizona		9,595,785.73		4		4.08		2,398,946.43		6.441		357		752		60.64
Texas		9,312,142.05		8		3.96		1,164,017.76		6.622		329		744		70.72
Ohio		8,286,671.31		8		3.53		1,035,833.91		6.443		358		745		75.55
Minnesota		5,133,031.57		4		2.18		1,283,257.89		6.500		357		738		77.71
Kentucky		4,979,418.14		3		2.12		1,659,806.05		6.784		282		738		74.59
New Mexico		4,583,182.63		2		1.95		2,291,591.32		6.500		178		671		73.14
Florida		4,311,998.88		1		1.84		4,311,998.88		6.950		358		710		80.00
Other*		24,354,823.63		29		10.37		839,821.50		6.776		327		733		68.91
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

*All states with loan concentration less than 1.84% of the total balance were placed in the other category.

Aggregate Group 2 Mortgage Loans

Loan-to-Value Ratios
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
20.01 - 25.00		513,969.81		1		0.22		513,969.81		6.475		358		800		24.01
25.01 - 30.00		1,377,295.00		2		0.59		688,647.50		6.604		256		736		28.74
30.01 - 35.00		668,665.19		1		0.28		668,665.19		6.500		178		785		34.81
35.01 - 40.00		1,762,851.17		3		0.75		587,617.06		6.625		358		768		37.39
40.01 - 45.00		7,964,484.63		6		3.39		1,327,414.11		6.577		255		759		43.74
45.01 - 50.00		7,670,216.54		7		3.26		1,095,745.22		6.405		358		769		48.10
50.01 - 55.00		19,813,746.81		20		8.43		990,687.34		6.516		325		727		53.25
55.01 - 60.00		25,076,334.18		23		10.67		1,090,275.40		6.268		358		747		57.37
60.01 - 65.00		38,235,872.65		30		16.27		1,274,529.09		6.417		326		732		63.12
65.01 - 70.00		50,896,772.22		39		21.66		1,305,045.44		6.399		332		741		68.01
70.01 - 75.00		60,775,272.66		45		25.87		1,350,561.61		6.423		336		721		73.50
75.01 - 80.00		20,193,520.29		18		8.59		1,121,862.24		6.641		358		738		79.84
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 23 of 31

Aggregate Group 2 Mortgage Loans

Current Mortgage Rate
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
5.500 - 5.999		11,546,757.47		7		4.91		1,649,536.78		5.925		358		693		69.53
6.000 - 6.499		132,120,527.45		104		56.23		1,270,389.69		6.255		347		742		64.55
6.500 - 6.999		81,286,502.91		64		34.60		1,270,101.61		6.670		307		732		64.92
7.000 - 7.499		6,561,641.61		13		2.79		504,741.66		7.194		358		731		70.79
7.500 - 7.999		2,151,810.54		4		0.92		537,952.64		7.826		358		729		66.84
8.000 - 8.499		842,734.96		2		0.36		421,367.48		8.286		358		715		67.01
8.500 - 8.999		439,026.21		1		0.19		439,026.21		8.500		359		632		75.00
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Property Type
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
Commercial - Industrial		2,384,509.36		2		1.01		1,192,254.68		6.682		179		732		44.11
Commercial - Mobile Home		2,873,579.18		2		1.22		1,436,789.59		6.673		178		726		58.41
Commercial - Office		6,873,862.73		5		2.93		1,374,772.55		6.540		172		774		56.15
Commercial - Retail		11,923,008.93		7		5.07		1,703,286.99		6.627		168		710		65.01
Commercial - Self Storage		6,186,598.42		1		2.63		6,186,598.42		6.000		178		771		68.13
Multi-Family		204,707,442.53		178		87.13		1,150,041.81		6.426		358		735		65.71
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Purpose
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
Cash Out Refinance		139,938,557.80		106		59.56		1,320,175.07		6.347		337		734		61.83
Purchase		83,444,912.46		81		35.52		1,030,184.10		6.603		340		737		70.60
Rate/Term Refinance		11,565,530.89		8		4.92		1,445,691.36		6.274		251		746		65.94
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 24 of 31

Aggregate Group 2 Mortgage Loans

Occupancy
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
Investor		234,604,764.92		194		99.85		1,209,302.91		6.433		334		736		65.19
Owner Occupied		344,236.23		1		0.15		344,236.23		7.550		357		766		36.32
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Range of Months Remaining to Scheduled Maturity
Description (months)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
0 - 120		2,729,005.99		3		1.16		909,668.66		6.758		118		750		65.67
121 - 180		27,512,552.63		14		11.71		1,965,182.33		6.461		178		739		60.93
241 - 360		204,707,442.53		178		87.13		1,150,041.81		6.426		358		735		65.71
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Collateral Grouped by Document Type
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
Full		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 25 of 31

Aggregate Group 2 Mortgage Loans

Collateral Grouped by FICO
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
621 - 640		1,105,233.65		2		0.47		552,616.83		7.400		358		634		75.00
641 - 660		7,123,126.77		2		3.03		3,561,563.39		6.397		271		656		68.92
661 - 680		15,833,825.12		13		6.74		1,217,986.55		6.472		358		671		62.10
681 - 700		24,059,412.53		22		10.24		1,093,609.66		6.175		358		689		66.88
701 - 720		41,566,948.27		32		17.69		1,298,967.13		6.516		328		711		69.16
721 - 740		34,683,951.89		30		14.76		1,156,131.73		6.537		339		732		66.27
741 - 760		35,757,838.60		29		15.22		1,233,028.92		6.501		339		754		67.98
761 - 780		49,752,483.36		42		21.18		1,184,582.94		6.363		318		772		59.55
781 - 800		15,940,694.07		17		6.78		937,687.89		6.462		351		791		64.36
801 +		9,125,486.89		6		3.88		1,520,914.48		6.285		319		805		59.95
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Collateral Grouped by Prepayment Penalty Terms
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
3 Year		10,616,421.98		15		4.52		707,761.47		6.941		358		739		67.27
5 Year		118,262,545.78		86		50.34		1,375,145.88		6.391		354		731		66.97
7 Year		18,649,531.29		19		7.94		981,554.28		6.416		358		720		66.32
10 Year		87,420,502.10		75		37.21		1,165,606.69		6.436		300		745		62.18
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Range of Months to First Roll
Description (months)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
FIXED		2,729,005.99		3		1.16		909,668.66		6.758		118		750		65.67
32.00 - 49.99		8,658,032.78		14		3.69		618,430.91		7.114		358		736		69.56
56.00 - 79.99		118,715,565.75		85		50.53		1,396,653.71		6.382		355		731		66.67
80.00 +		104,846,396.63		93		44.63		1,127,380.61		6.430		314		741		63.05
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 26 of 31

Aggregate Group 2 Mortgage Loans

Range of Gross Margin
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
FIXED		2,729,005.99		3		1.16		909,668.66		6.758		118		750		65.67
2.250 - 2.499		66,880,162.44		54		28.47		1,238,521.53		6.207		358		727		63.41
2.500 - 2.749		91,723,597.55		74		39.04		1,239,508.08		6.499		352		740		66.39
2.750 - 2.999		40,172,648.73		35		17.10		1,147,789.96		6.409		346		740		66.47
3.000 - 3.249		31,883,618.85		25		13.57		1,275,344.75		6.650		234		735		63.52
3.250 - 3.499		344,236.23		1		0.15		344,236.23		7.550		357		766		36.32
3.500 - 3.749		772,400.51		2		0.33		386,200.26		8.230		359		651		75.00
3.750 - 3.999		443,330.85		1		0.19		443,330.85		8.250		358		689		68.31
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 27 of 31

Aggregate Group 2 Mortgage Loans

Range of Lifetime Caps
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
FIXED		2,729,005.99		3		1.16		909,668.66		6.758		118		750		65.67
11.500 - 11.999		11,546,757.47		7		4.91		1,649,536.78		5.925		358		693		69.53
12.000 - 12.499		132,120,527.45		104		56.23		1,270,389.69		6.255		347		742		64.55
12.500 - 12.999		78,557,496.92		61		33.44		1,287,827.82		6.667		313		731		64.90
13.000 - 13.499		6,561,641.61		13		2.79		504,741.66		7.194		358		731		70.79
13.500 - 13.999		2,151,810.54		4		0.92		537,952.64		7.826		358		729		66.84
14.000 - 14.499		842,734.96		2		0.36		421,367.48		8.286		358		715		67.01
14.500 - 14.999		439,026.21		1		0.19		439,026.21		8.500		359		632		75.00
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 28 of 31

Aggregate Group 2 Mortgage Loans

Next Interest Adjustment Date
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
FIXED		2,729,005.99		3		1.16		909,668.66		6.758		118		750		65.67
December 2009		3,001,428.16		5		1.28		600,285.63		7.358		357		753		67.19
January 2010		3,256,142.74		4		1.39		814,035.69		6.587		358		747		69.81
February 2010		2,400,461.88		5		1.02		480,092.38		7.524		359		700		72.18
November 2011		772,578.45		1		0.33		772,578.45		6.325		356		733		71.28
December 2011		32,172,813.99		19		13.69		1,693,306.00		6.519		346		749		67.63
January 2012		57,002,020.13		37		24.26		1,540,595.14		6.331		358		720		66.40
February 2012		24,182,653.18		23		10.29		1,051,419.70		6.303		359		733		66.72
March 2012		4,585,500.00		5		1.95		917,100.00		6.465		360		719		62.27
December 2013		8,985,392.47		8		3.82		1,123,174.06		6.297		357		691		63.67
January 2014		7,152,358.48		9		3.04		794,706.50		6.600		358		755		68.88
February 2014		914,280.34		1		0.39		914,280.34		6.700		359		763		57.19
March 2014		1,597,500.00		1		0.68		1,597,500.00		6.100		360		700		75.00
November 2016		586,603.06		1		0.25		586,603.06		6.375		356		711		80.00
December 2016		28,817,451.15		23		12.27		1,252,932.66		6.499		332		742		65.74
January 2017		37,230,794.16		30		15.85		1,241,026.47		6.370		289		747		60.45
February 2017		16,882,016.97		18		7.19		937,889.83		6.459		304		743		60.09
March 2017		1,980,000.00		1		0.84		1,980,000.00		6.425		180		779		63.09
April 2017		700,000.00		1		0.30		700,000.00		6.475		360		795		60.00
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 29 of 31

Aggregate Group 2 Mortgage Loans

Initial Fixed Period
Description (months)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
FIXED		2,729,005.99		3		1.16		909,668.66		6.758		118		750		65.67
36		8,658,032.78		14		3.69		618,430.91		7.114		358		736		69.56
60		118,715,565.75		85		50.53		1,396,653.71		6.382		355		731		66.67
84		18,649,531.29		19		7.94		981,554.28		6.416		358		720		66.32
120		86,196,865.34		74		36.69		1,164,822.50		6.432		305		745		62.34
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Initial Rate Cap
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
FIXED		2,729,005.99		3		1.16		909,668.66		6.758		118		750		65.67
3.000		232,219,995.16		192		98.84		1,209,479.14		6.431		337		735		65.14
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Subsequent Rate Cap
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
FIXED		2,729,005.99		3		1.16		909,668.66		6.758		118		750		65.67
1.000		226,947,721.69		187		96.59		1,213,624.18		6.429		337		735		65.02
3.000		5,272,273.47		5		2.24		1,054,454.69		6.495		320		736		70.52
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 30 of 31

Aggregate Group 2 Mortgage Loans

Collateral Grouped by Occupancy Rates
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
80.00 - 89.99		6,549,306.34		7		2.79		935,615.19		6.504		253		728		66.49
90.00 - 99.99		111,375,722.69		68		47.40		1,637,878.27		6.414		337		736		67.88
100.00 +		117,023,972.12		120		49.81		975,199.77		6.450		336		735		62.47
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Collateral Grouped by Year Built
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
1954 and Earlier		33,572,961.32		38		14.29		883,498.98		6.479		343		737		62.14
1955-1959		18,415,470.91		18		7.84		1,023,081.72		6.456		358		731		69.35
1960-1964		48,457,400.23		38		20.62		1,275,194.74		6.338		358		730		65.75
1965-1969		12,611,788.89		13		5.37		970,137.61		6.541		357		723		69.43
1970-1974		29,673,508.53		19		12.63		1,561,763.61		6.521		337		732		71.53
1975-1979		20,621,371.35		15		8.78		1,374,758.09		6.472		318		738		61.07
1980-1984		13,248,766.46		14		5.64		946,340.46		6.634		273		725		64.88
1985-1989		34,572,852.40		21		14.72		1,646,326.30		6.295		315		742		62.25
1990-1994		13,816,320.20		9		5.88		1,535,146.69		6.346		333		755		61.57
1995-1999		4,696,523.17		4		2.00		1,174,130.79		6.376		332		749		62.21
2000-2004		1,097,215.71		1		0.47		1,097,215.71		6.875		117		743		61.11
2005-2009		4,164,821.98		5		1.77		832,964.40		6.744		282		752		66.67
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Collateral Grouped by Renovated
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
Yes		185,320,547.49		137		78.88		1,352,704.73		6.384		336		736		65.38
No		49,628,453.66		58		21.12		855,662.99		6.624		326		735		64.27
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

ISAC 2007-2

Computational Materials: Preliminary Structural Term Sheet

Page 31 of 31

Aggregate Group 2 Mortgage Loans

Collateral Grouped by Debt Service Coverage Ratios
Description (%)	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
1.13 and Less		37,310,059.19		26		15.88		1,435,002.28		6.629		357		728		67.96
1.14 - 1.19		64,691,285.07		57		27.53		1,134,934.83		6.347		358		726		67.07
1.20 - 1.21		38,287,327.70		32		16.30		1,196,478.99		6.467		354		748		64.47
1.22 - 1.24		27,872,464.20		24		11.86		1,161,352.68		6.411		345		746		68.51
1.25 - 1.29		30,085,265.85		25		12.81		1,203,410.63		6.408		289		718		66.23
1.30 - 1.49		31,329,515.78		23		13.33		1,362,152.86		6.403		270		753		59.43
1.50 - 2.08		4,859,113.55		7		2.07		694,159.08		6.347		305		753		38.43
2.09 and Greater		513,969.81		1		0.22		513,969.81		6.475		358		800		24.01
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15

Aggregate Group 2 Mortgage Loans

Collateral Grouped by Number of Units
Description	Current Balance ($)		# of Loans		% of Total		Average Balance ($)		Gross WAC (%)		Rem Term (mos)		WA FICO		Orig. LTV (%)
0 - 4		6,452,031.16		5		2.75		1,290,406.23		6.584		169		743		60.93
5 - 9		38,560,898.72		58		16.41		664,843.08		6.529		341		735		60.67
10 - 14		28,232,735.58		33		12.02		855,537.44		6.470		314		733		62.01
15 - 24		51,315,446.33		46		21.84		1,115,553.18		6.447		341		732		65.11
25 - 49		74,250,940.40		41		31.60		1,810,998.55		6.356		351		735		66.62
50 +		36,136,948.96		12		15.38		3,011,412.41		6.422		327		743		70.18
TOTAL		234,949,001.15		195		100.00		1,204,866.67		6.434		334		736		65.15