WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW SELECT DIMENSIONS SERIES - MID-CAP EQUITY
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DECEMBER 31, 2000
<PERIOD-END> JUNE 30, 2000
<INVESTMENTS-AT-COST> 127,099,049
<INVESTMENTS-AT-VALUE> 157,297,782
<RECEIVABLES> 214,239
<ASSETS-OTHER> 16,268
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 157,528,289
<PAYABLE-FOR-SECURITIES> (146,043)
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (130,200)
<TOTAL-LIABILITIES> (276,243)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 124,155,853
<SHARES-COMMON-STOCK> 6,727,760
<SHARES-COMMON-PRIOR> 3,748,826
<ACCUMULATED-NII-CURRENT> (241,901)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,139,361
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 30,198,733
<NET-ASSETS> 157,252,046
<DIVIDEND-INCOME> 26,517
<INTEREST-INCOME> 227,928
<OTHER-INCOME> 0
<EXPENSES-NET> (496,346)
<NET-INVESTMENT-INCOME> (241,901)
<REALIZED-GAINS-CURRENT> 3,164,613
<APPREC-INCREASE-CURRENT> 5,017,680
<NET-CHANGE-FROM-OPS> 7,940,392
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (9,796,856)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,531,768
<NUMBER-OF-SHARES-REDEEMED> (552,834)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 72,303,522
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 9,771,604
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (479,467)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (496,346)
<AVERAGE-NET-ASSETS> 128,059,481
<PER-SHARE-NAV-BEGIN> 22.66
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 2.30
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (1.55)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 23.37
<EXPENSE-RATIO> 0.78%
</TABLE>
