<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW INSURED CALIFORNIA MUNICIPAL SECURITIES
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-END> OCT-31-2000
<INVESTMENTS-AT-COST> 56,302,638
<INVESTMENTS-AT-VALUE> 60,381,020
<RECEIVABLES> 1,011,229
<ASSETS-OTHER> 44,933
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 61,437,182
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (77,161)
<TOTAL-LIABILITIES> (77,161)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 57,071,229
<SHARES-COMMON-STOCK> 4,025,613
<SHARES-COMMON-PRIOR> 4,145,213
<ACCUMULATED-NII-CURRENT> 323,535
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (113,125)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 4,078,382
<NET-ASSETS> 61,360,021
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,449,213
<OTHER-INCOME> 0
<EXPENSES-NET> (333,175)
<NET-INVESTMENT-INCOME> 3,116,038
<REALIZED-GAINS-CURRENT> 311,387
<APPREC-INCREASE-CURRENT> 2,798,692
<NET-CHANGE-FROM-OPS> 6,226,117
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3,058,655)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 119,600
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 1,586,062
<ACCUMULATED-NII-PRIOR> 266,152
<ACCUMULATED-GAINS-PRIOR> (424,512)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (210,626)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (338,750)
<AVERAGE-NET-ASSETS> 59,849,965
<PER-SHARE-NAV-BEGIN> 14.42
<PER-SHARE-NII> 0.76
<PER-SHARE-GAIN-APPREC> 0.81
<PER-SHARE-DIVIDEND> (0.75)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 15.24
<EXPENSE-RATIO> 0.56
</TABLE>
