Exhibit (a)(3)

DWS INVESTMENT TRUST

Amended and Restated Establishment and Designation of Series and

Classes of Shares of Beneficial Interest, With $0.01 Par Value

WHEREAS, the Trustees of DWS Investment Trust (the “Trust”), acting pursuant to the Trust’s Amended and Restated Declaration of Trust (the “Declaration”), dated June 2, 2008, as amended, had previously established and designated one or more series of shares of beneficial interest in the Trust (each, a “Series” composed of “Shares”) pursuant to one or more designations of series (the “Prior Series Designations”) and had previously established and designated one or more classes of Shares (each, a “Class”) for some or all of the Series pursuant to one or more designations of classes (the “Prior Class Designations,” such Prior Series Designations and Prior Class Designations referred to herein collectively as the “Prior Designations”);

WHEREAS, the Trustees of the Trust, effective January 23, 2009, amended and restated the Trust’s Prior Designations, the terms of the amended and restated designation to supersede any terms set forth in the Prior Designations;

WHEREAS, pursuant to Article V, Section 5.12 of the Declaration, the Trustees, at a meeting held on May 4, 2010, authorized the following Series redesignation to be effective June 1, 2010:

·   The Series of Shares known as DWS Large Company Growth Fund is hereby redesignated “DWS Large Cap Focus Growth Fund;”

NOW THEREFORE, pursuant to Article VIII, Section 8.3 of the Declaration, the Trustees of the Trust, effective June 1, 2010, hereby amend and restate the Trust’s Prior Designations, the terms of which to supersede any terms set forth in the Prior Designations:

1.           The following Series of Shares and Classes thereof are established and designated, the Shares, with $0.01 par value, of such Series and Classes to be subject to the terms of, and entitled to all the rights and preferences accorded to Shares of a Series, and, if applicable, a Class under, the Declaration and this amended and restated designation:

DWS Capital Growth Fund                                                                 Class A

Class B

Class C

Class R

Class S

Institutional Class

DWS Growth & Income Fund                                                            Class A

Class B

Class C

Class S

Institutional Class

DWS Large Cap Focus Growth Fund                                               Class A

Class B

Class C

Class S

Institutional Class

DWS S&P 500 Index Fund                                                                 Class A

Class B

Class C

Class S

DWS Small Cap Core Fund                                                                Class A

Class B

Class C

Class S

2.           For Shares of a Class of a Series, the relative rights and preferences of such Class shall be as determined by the Trustees of the Trust from time to time in accordance with the Declaration and set forth in the Trust’s Multi-Distribution System Plan adopted pursuant to Rule 18f-3 under the Investment Company Act of 1940, as amended, as such Plan may be amended from time to time, or as otherwise required by applicable law.  The Shares of a Class of a Series shall have such other terms, features and qualifications as may be determined by the Trustees of the Trust from time to time in accordance with the Declaration and set forth in the current prospectus and statement of additional information of the Series relating to such Class, contained in the Trust’s registration statement under the Securities Act of 1933, as amended, as such prospectus or statement of additional information may be further supplemented from time to time.

3.           The designation of the Series and Classes hereby shall not impair the power of the Trustees from time to time to designate additional Series and Classes of Shares of the Trust.

IN WITNESS WHEREOF, the undersigned, being a majority of the Trustees of the Trust, have executed this instrument as of this 4th day of May 2010.

[TRUSTEE SIGNATURES BEGIN ON THE FOLLOWING PAGE]

/s/John W. Ballantine	/s/Henry P. Becton, Jr.
John W. Ballantine, Trustee	Henry P. Becton, Jr., Trustee
/s/Dawn-Marie Driscoll	/s/Keith R. Fox
Dawn-Marie Driscoll, Trustee	Keith R. Fox, Trustee
/s/Paul K. Freeman	/s/Kenneth C. Froewiss
Paul K. Freeman, Trustee	Kenneth C. Froewiss, Trustee
/s/Richard J. Herring	/s/William McClayton
Richard J. Herring, Trustee	William McClayton, Trustee
/s/Rebecca W. Rimel	/s/William N. Searcy, Jr.
Rebecca W. Rimel, Trustee	William N. Searcy, Jr., Trustee
/s/Jean Gleason Stromberg	/s/Robert H. Wadsworth
Jean Gleason Stromberg, Trustee	Robert H. Wadsworth, Trustee