<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 015
<NAME> State Street Research Government Income Fund - Class B(1)
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-START> NOV-01-1999
<PERIOD-END> OCT-31-2000
<INVESTMENTS-AT-COST> 825,773,970
<INVESTMENTS-AT-VALUE> 814,577,570
<RECEIVABLES> 32,151,931
<ASSETS-OTHER> 14,928
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 846,744,429
<PAYABLE-FOR-SECURITIES> 84,472,044
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 136,428,683
<TOTAL-LIABILITIES> 220,900,727
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 668,876,564
<SHARES-COMMON-STOCK> 2,851,772
<SHARES-COMMON-PRIOR> 1,998,104
<ACCUMULATED-NII-CURRENT> 1,521,256
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 33,526,876
<ACCUM-APPREC-OR-DEPREC> (11,027,242)
<NET-ASSETS> 625,843,702
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 45,315,508
<OTHER-INCOME> 0
<EXPENSES-NET> 7,929,251
<NET-INVESTMENT-INCOME> 37,386,257
<REALIZED-GAINS-CURRENT> (6,338,583)
<APPREC-INCREASE-CURRENT> 6,093,795
<NET-CHANGE-FROM-OPS> 37,141,469
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,626,196)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,297,373
<NUMBER-OF-SHARES-REDEEMED> (561,145)
<SHARES-REINVESTED> 117,440
<NET-CHANGE-IN-ASSETS> (30,142,851)
<ACCUMULATED-NII-PRIOR> 2,234,804
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 26,721,650
<GROSS-ADVISORY-FEES> 3,649,845
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7,956,826
<AVERAGE-NET-ASSETS> 618,403,775
<PER-SHARE-NAV-BEGIN> 12.14
<PER-SHARE-NII> 0.65
<PER-SHARE-GAIN-APPREC> 0.01
<PER-SHARE-DIVIDEND> (0.69)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.11
<EXPENSE-RATIO> 1.85
</TABLE>
