<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains Summary Financial Information extracted from the Form
N-SAR and the financial statements and is qualified in its entirety by
references to such documents.
</LEGEND>
<SERIES>
   <NUMBER> 051
   <NAME> NUVEEN FLAGSHIP INTERMEDIATE MUNI BOND FUND - CLASS A
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          APR-30-2000
<PERIOD-START>                             MAY-01-1999
<PERIOD-END>                               APR-30-2000
<INVESTMENTS-AT-COST>                            57149
<INVESTMENTS-AT-VALUE>                           56093
<RECEIVABLES>                                     1131
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   57224
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         1235
<TOTAL-LIABILITIES>                               1235
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         57274
<SHARES-COMMON-STOCK>                             4417
<SHARES-COMMON-PRIOR>                             4705
<ACCUMULATED-NII-CURRENT>                            8
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          (237)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        (1056)
<NET-ASSETS>                                     55989
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 3366
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     506
<NET-INVESTMENT-INCOME>                           2860
<REALIZED-GAINS-CURRENT>                         (230)
<APPREC-INCREASE-CURRENT>                       (4132)
<NET-CHANGE-FROM-OPS>                           (1502)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         2386
<DISTRIBUTIONS-OF-GAINS>                           716
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1650
<NUMBER-OF-SHARES-REDEEMED>                       2070
<SHARES-REINVESTED>                                132
<NET-CHANGE-IN-ASSETS>                          (1114)
<ACCUMULATED-NII-PRIOR>                              5
<ACCUMULATED-GAINS-PRIOR>                         1007
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              304
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    705
<AVERAGE-NET-ASSETS>                             49777
<PER-SHARE-NAV-BEGIN>                            11.00
<PER-SHARE-NII>                                    .50
<PER-SHARE-GAIN-APPREC>                          (.74)
<PER-SHARE-DIVIDEND>                             (.50)
<PER-SHARE-DISTRIBUTIONS>                        (.15)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.11
<EXPENSE-RATIO>                                    .74


</TABLE>