SC 13G

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                                (Amendment No. )*

                      Integrated Measurement Systems Inc..
                                (Name of Issuer)

                                  Common Stock
                         (Title and Class of Securities)

                                    457923100
                                 (CUSIP Number)











     *The  remainder  of this cover  page  shall be filled  out for a  reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

     The  information  required on the remainder of this cover page shall not be
deemed to be "filed"  for the purpose of Section 18 of the  Securities  Exchange
Act of 1934 ("Act") or otherwise  subject to the  liabilities of that section of
the Act but shall be subject to all other  provisions of the Act  (however,  see
the Notes).






                          SCHEDULE 13G

CUSIP No.457923100                                    Page 2 of 4

1    NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE
PERSONS
          Invista Capital Management, Inc.

          Principal Mutual Life Insurance Company

2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*    (a)
                                                          (b) 
3    SEC USE ONLY

4    CITIZENSHIP OR PLACE OF ORGANIZATION

          Invista Capital Management, Inc.           State of Iowa

          Principal Mutual Life Insurance Company   State of Iowa



NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

          5    SOLE VOTING POWER
          Invista Capital Management, Inc.                    0
          Principal Mutual Life Insurance Company             0

          6    SHARED VOTING POWER
          Invista Capital Management, Inc.                    521,600
          Principal Mutual Life Insurance Company             521,600

          7    SOLE DISPOSITIVE POWER
          Invista Capital Management, Inc.                    0
          Principal Mutual Life Insurance Company             0

          8    SHARED DISPOSITIVE POWER
          Invista Capital Management, Inc.                    521,600
          Principal Mutual Life Insurance Company             521,600

9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
          Invista Capital Management, Inc.                    521,600
          Principal Mutual Life Insurance Company             521,600







10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
     SHARES*

11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          Invista Capital Management, Inc.                      7.0%
          Principal Mutual Life Insurance Company               7.0%

12   TYPE OF REPORTING PERSON*

          Invista Capital Management, Inc.                      IA
          Principal Mutual Life Insurance Company               HC






Schedule 13G

ITEM 1(a) Name of Issuer:       Integrated Measurement Systems Inc.

ITEM 1(b) Address of Issuer's Principal Executive Offices:
                                    9525 SW Gemini Drive
                                    Beaverton, OR 97008

ITEM 2(a) Name of Persons Filing:      Invista Capital Management, Inc.
                                       Principal Mutual Life Insurance Co.

ITEM 2(b) Address of Principal Business Office:

Invista Capital Management, Inc.       Principal Mutual Life Ins. Co.
699 Walnut                             711 High Street
1800 Hub Tower                         Des Moines, IA   50392-0088
Des Moines, IA  50309

ITEM 2(c) Citizenship:
            Invista Capital Management, Inc. - State of Iowa
            Principal Mutual Life Insurance Co. - State of Iowa

ITEM 2(d) Title of Class of Securities:  Common Stock

ITEM 2(e) CUSIP Number: 457923100

ITEM 3: This  statement is filed pursuant to Rule 13d-1(b) by a person who is an
investment advisor  registered under Section 203 of the Investment  Advisers Act
of 1940, and a person who is a parent holding company in accordance with Section
240.13d-1(b)(1)(ii)(G).

ITEM 4:     Ownership:

            (a) Amount Beneficially Owned:
521,600 Shares Common Stock presently held by Invista Cap. Mgmt.
521,600  Shares Common Stock presently held by Principal Mutual

                (b)  Percent of Class:
6.95%     Invista Capital Management, Inc.
6.95%     Principal Mutual Life Insurance Co.

                (c) Number of shares as to which such person has: 
          (i) Sole power to vote or to direct the vote:
0 Invista Capital Management, Inc.
0 Principal Mutual Life Insurance Co.





                (ii) Shared power to vote or to direct the vote:
521,600  Shares Common Stock presently held by Invista Capital Management, Inc.
521,600 Shares Common Stock presently held by Principal Mutual Life Ins.Co.

                (iii) Sole power to dispose or to direct the disposition of:
0 Invista Capital Management, Inc.
0 Principal Mutual Life Ins. Co.

                (iv) Shared  power to dispose or to direct the  disposition  of:
521,600 Shares Common Stock presently held by Invista Capital  Management,  Inc.
521,600 Shares Common Stock  presently  held by Principal  Mutual Life Ins. Co.

ITEM 5:     Ownership of 5% or Less of Class:  Not Applicable

ITEM 6:     Ownership of More than 5% on Behalf of Another Person:Not Applicable

ITEM 7:     Identification and Classification of the Subsidiary which Acquired
the Security being Reported on by the Parent Holding Company:  
               See Exhibit attached

ITEM 8:     Identification and Classification of Members of the Group:  
               Not Applicable

ITEM 9:     Notice of Dissolution of Group:  Not applicable

ITEM 10:  Certification:  By  signing  below I certify  that,  to the best of my
knowledge  and belief,  the  securities  referred to above were  acquired in the
ordinary  course of business and were not acquired for the purpose of and do not
have the effect of  changing  or  influencing  the control of the issuer of such
securities  and were not acquired in connection  with or as a participant in any
transaction having such purposes or effect.

                                    SIGNATURE

After  reasonable  inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, completeand correct.

INVISTA CAPITAL MANAGEMENT, INC.

By /s/ Lisa M. Smith
Lisa M. Smith, Financial & Compliance Officer

PRINCIPAL MUTUAL LIFE INSURANCE COMPANY
By:  INVISTA CAPITAL MANAGEMENT, INC.

By /s/ Lisa M. Smith
Lisa M. Smith, Financial & Compliance Officer
Dated this 13th day of February, 1998

EX-99

          EXHIBIT 99.1



   Invista Capital Management, Inc.
    Item 3 Classification:
        (e)  Investment  Adviser  registered  under Section  203  of  the
             Investment Advisers Act of 1940