VAN KAMPEN FOCUS PORTFOLIOS SERIES 256, 487, EX-99.4.1, 2000-12-05

VAN KAMPEN FOCUS PORTFOLIOS SERIES 256
487, EX-99.4.1, 2000-12-05

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                                                                     EXHIBIT 4.1

                                INTERACTIVE DATA
                           FINANCIAL TIMES Information
             100 William Street, 15th Floor, New York, NY 10038 USA
                    Tel: (212) 269-6300 Fax: (212) 771-6445


                                December 4, 2000


Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, IL 60181


         Re: Van Kampen Focus Portfolios
             The Dow 30SM Index Portfolio, Series 11
             (A Unit Investment Trust) Registered Under the Securities Act
             of 1933, File No. 333-49748


  Gentlemen:

         We have examined the Registration Statement for the above captioned
Fund, a copy of which is attached hereto.

         We hereby consent to the reference in the Prospectus and Registration
Statement for the above captioned Fund to Interactive Data Corporation, as the
Evaluator, and to the use of the Obligations prepared by us which are referred
to in such Prospectus and Statement.

         You are authorized to file copies of this letter with the Securities
and Exchange Commission.

Very truly yours,


Steve Miano
Director Fixed Income Data Operations