<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> 022
   <NAME> NUVEEN CALIFORNIA INSURED MUNICIPAL BOND FUND - CLASS B
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          FEB-28-2001
<PERIOD-START>                             MAR-01-2000
<PERIOD-END>                               AUG-31-2000
<INVESTMENTS-AT-COST>                           214997
<INVESTMENTS-AT-VALUE>                          227873
<RECEIVABLES>                                     8753
<ASSETS-OTHER>                                     338
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  236964
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          799
<TOTAL-LIABILITIES>                                799
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        225485
<SHARES-COMMON-STOCK>                             1069
<SHARES-COMMON-PRIOR>                             1069
<ACCUMULATED-NII-CURRENT>                          175
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (2372)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         12877
<NET-ASSETS>                                    236165
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 6953
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     908
<NET-INVESTMENT-INCOME>                           6045
<REALIZED-GAINS-CURRENT>                         (163)
<APPREC-INCREASE-CURRENT>                        10072
<NET-CHANGE-FROM-OPS>                            15954
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          243
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            145
<NUMBER-OF-SHARES-REDEEMED>                        156
<SHARES-REINVESTED>                                 10
<NET-CHANGE-IN-ASSETS>                            7873
<ACCUMULATED-NII-PRIOR>                            190
<ACCUMULATED-GAINS-PRIOR>                       (2209)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              635
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    918
<AVERAGE-NET-ASSETS>                             11034
<PER-SHARE-NAV-BEGIN>                            10.20
<PER-SHARE-NII>                                    .23
<PER-SHARE-GAIN-APPREC>                            .45
<PER-SHARE-DIVIDEND>                             (.23)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.65
<EXPENSE-RATIO>                                   1.61


</TABLE>