WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW VARIABLE INVESTMENT SERIES STRAT X
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 594,185,310
<INVESTMENTS-AT-VALUE> 726,538,683
<RECEIVABLES> 4,406,793
<ASSETS-OTHER> 2,259
<OTHER-ITEMS-ASSETS> 98,586
<TOTAL-ASSETS> 731,046,321
<PAYABLE-FOR-SECURITIES> (3,973,365)
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (1,359,189)
<TOTAL-LIABILITIES> (5,332,554)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 567,462,696
<SHARES-COMMON-STOCK> 43,202,615
<SHARES-COMMON-PRIOR> 38,207,752
<ACCUMULATED-NII-CURRENT> 53,797
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 25,843,901
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 132,353,373
<NET-ASSETS> 723,929,905
<DIVIDEND-INCOME> 1,591,588
<INTEREST-INCOME> 9,225,616
<OTHER-INCOME> 0
<EXPENSES-NET> (1,872,914)
<NET-INVESTMENT-INCOME> 8,944,290
<REALIZED-GAINS-CURRENT> 34,738,023
<APPREC-INCREASE-CURRENT> (38,093,209)
<NET-CHANGE-FROM-OPS> 5,589,104
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (8,878,667)
<DISTRIBUTIONS-OF-GAINS> (85,486,980)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,709,828
<NUMBER-OF-SHARES-REDEEMED> (3,503,182)
<SHARES-REINVESTED> 5,788,216
<NET-CHANGE-IN-ASSETS> (3,986,909)
<ACCUMULATED-NII-PRIOR> 36
<ACCUMULATED-GAINS-PRIOR> 76,802,603
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (1,814,334)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (1,872,914)
<AVERAGE-NET-ASSETS> 70,820,648
<PER-SHARE-NAV-BEGIN> 19.10
<PER-SHARE-NII> 0.23
<PER-SHARE-GAIN-APPREC> (0.08)
<PER-SHARE-DIVIDEND> (0.23)
<PER-SHARE-DISTRIBUTIONS> (2.26)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.76
<EXPENSE-RATIO> 0.52
</TABLE>
