MORGAN STANLEY DEAN WITTER SELECT DIMENSIONS INVESTMENT SERI, 497, 1999-07-12

MORGAN STANLEY DEAN WITTER SELECT DIMENSIONS INVESTMENT SERI
497, 1999-07-12

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                                                Filed Pursuant to Rule 497(e)
                                                Registration File No.: 33-54047


                       SUPPLEMENT TO THE PROSPECTUS OF
                          MORGAN STANLEY DEAN WITTER
                     SELECT DIMENSIONS INVESTMENT SERIES
                              DATED MAY 1, 1999

   The sentences pertaining to the Developing Growth Portfolio of the Fund in
the section of the Prospectus entitled "Portfolio Management" are hereby
replaced by the following:

    DEVELOPING GROWTH PORTFOLIO -- Armon Bar-Tur, Vice President of the
    Investment Manager, has been the primary portfolio manager of the
    Portfolio since July 12, 1999. Mr. Bar-Tur had assisted the former
    primary portfolio manager of the Portfolio since May 1998. Mr. Bar-Tur
    has been a portfolio manager with the Investment Manager since October
    1996, prior to which time he was a research analyst with Merrill Lynch
    Asset Management.

July 12, 1999

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