<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW MID-CAP EQUITY TRUST - CLASS D
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-2000
<PERIOD-END> MAY-31-2000
<INVESTMENTS-AT-COST> 1,219,543,414
<INVESTMENTS-AT-VALUE> 1,725,981,822
<RECEIVABLES> 3,122,808
<ASSETS-OTHER> 341,953
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,729,446,583
<PAYABLE-FOR-SECURITIES> (2,887,282)
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (4,540,307)
<TOTAL-LIABILITIES> (7,427,589)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,229,012,145
<SHARES-COMMON-STOCK> 556,992
<SHARES-COMMON-PRIOR> 129,081
<ACCUMULATED-NII-CURRENT> (11,448,593)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1,982,965)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 506,438,407
<NET-ASSETS> 18,570,627
<DIVIDEND-INCOME> 442,859
<INTEREST-INCOME> 2,807,460
<OTHER-INCOME> 0
<EXPENSES-NET> (14,698,912)
<NET-INVESTMENT-INCOME> (11,448,593)
<REALIZED-GAINS-CURRENT> 15,097,466
<APPREC-INCREASE-CURRENT> (105,163,128)
<NET-CHANGE-FROM-OPS> (101,514,255)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (137,421)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 714,132
<NUMBER-OF-SHARES-REDEEMED> (286,221)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 346,873,326
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 20,287,273
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (7,201,998)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (14,698,912)
<AVERAGE-NET-ASSETS> 12,907,210
<PER-SHARE-NAV-BEGIN> 33.97
<PER-SHARE-NII> (0.11)
<PER-SHARE-GAIN-APPREC> 0.36
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (0.88)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 33.34
<EXPENSE-RATIO> 0.83
</TABLE>
