<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MORGAN STANLEY DEAN WITTER QUALITY MUNICIPAL SECURITIES
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-END> OCT-31-2000
<INVESTMENTS-AT-COST> 333,922,191
<INVESTMENTS-AT-VALUE> 324,229,796
<RECEIVABLES> 6,172,674
<ASSETS-OTHER> 146,035
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 330,548,505
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (492,926)
<TOTAL-LIABILITIES> (492,926)
<SENIOR-EQUITY> 97,000,000
<PAID-IN-CAPITAL-COMMON> 254,471,648
<SHARES-COMMON-STOCK> 17,105,513
<SHARES-COMMON-PRIOR> 17,718,413
<ACCUMULATED-NII-CURRENT> 1,717,516
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (13,441,190)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (9,692,395)
<NET-ASSETS> 330,055,579
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 9,279,756
<OTHER-INCOME> 0
<EXPENSES-NET> (903,854)
<NET-INVESTMENT-INCOME> 8,375,902
<REALIZED-GAINS-CURRENT> 844,012
<APPREC-INCREASE-CURRENT> 1,587,662
<NET-CHANGE-FROM-OPS> 10,807,576
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (8,853,221)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> (612,900)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (5,319,001)
<ACCUMULATED-NII-PRIOR> 2,194,835
<ACCUMULATED-GAINS-PRIOR> (14,285,202)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (579,026)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (912,839)
<AVERAGE-NET-ASSETS> 233,871,933
<PER-SHARE-NAV-BEGIN> 13.45
<PER-SHARE-NII> 0.48
<PER-SHARE-GAIN-APPREC> 0.14
<PER-SHARE-DIVIDEND> (0.51)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.62
<EXPENSE-RATIO> 0.78
</TABLE>
