Exhibit (i)(3)
                          [ROPES & GRAY LLP LETTERHEAD]






November 13, 2007                                         Thomas R. Hiller
                                                          (617) 951-7439
                                                          thiller@ropesgray.com





DWS Target Date Series
Two International Place
Boston, MA  02110

Ladies and Gentlemen:

We are furnishing this opinion in connection with the Registration Statement on
Form N-1A (the "Registration Statement") filed under the Securities Act of 1933,
as amended, by DWS Target Date Series (the "Trust") for the registration of an
indefinite number of its shares of beneficial interest (the "Shares") of DWS
LifeCompass 2040 Fund (the "Fund").

We did not act as counsel for the Trust in connection with matters related to
its initial organization and have relied with respect to those matters on an
opinion of counsel heretofore filed as an exhibit to the Registration Statement.
We have acted as counsel for the Trust in connection with the designation and
organization of the Fund. We are familiar with the actions taken by the Trust's
Trustees to authorize this issuance of the Shares. We have examined the Trust's
records of Trustee and shareholder action, its Bylaws, and its Amended and
Restated Declaration of Trust, as amended (the "Declaration of Trust"), on file
at the office of the Secretary of State of The Commonwealth of Massachusetts. We
have examined copies of the Registration Statement, in the form filed with the
Securities and Exchange Commission, and such other documents as we deem
necessary for the purpose of this opinion.

Based upon the foregoing, we are of the opinion that the issue and sale by the
Trust of the authorized but unissued Shares of the Fund have been duly
authorized under Massachusetts law. Upon the original issue and sale of any such
authorized but unissued Shares of the Fund and upon receipt by the Trust of the
authorized consideration therefor in an amount not less than the applicable net
asset value, the Shares so issued will be validly issued, fully paid and
nonassessable by the Trust.

The Trust is an entity of the type commonly known as a "Massachusetts business
trust." Under Massachusetts law, shareholders could, under certain
circumstances, be held personally liable for the obligations of the Trust.
However, the Declaration of Trust disclaims shareholder liability for acts or
obligations of the Trust and provides that notice of such disclaimer shall be
given in each agreement, obligation, or instrument entered into or executed by
the Trust or the Trustees. The Declaration of Trust provides for allocation of
the assets and liabilities of the Trust among its series, and further provides
for indemnification out of the property of a series for all loss

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ROPES & GRAP LLP

DWS Target Date Series              - 2 -                     November 13, 2007

and expense of any shareholder of the series held personally liable solely by
reason of his being or having been a shareholder. Thus, the risk of a
shareholder's incurring financial loss on account of shareholder liability is
limited to circumstances in which the series itself would be unable to meet its
obligations.

We consent to the filing of this opinion as an exhibit to the Registration
Statement.

Very truly yours,

/s/  Ropes & Gray LLP

Ropes & Gray LLP