<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM JUNE 30, 2000 SEMI-ANNUAL REPORT AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER> 2
<NAME> OBERWEIS MICRO-CAP PORTFOLIO
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 17,422
<INVESTMENTS-AT-VALUE> 22,836
<RECEIVABLES> 143
<ASSETS-OTHER> 98
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 23,077
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 316
<TOTAL-LIABILITIES> 316
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 15,018
<SHARES-COMMON-STOCK> 1,252
<SHARES-COMMON-PRIOR> 1,258
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,351
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5,392
<NET-ASSETS> 22,761
<DIVIDEND-INCOME> 6
<INTEREST-INCOME> 2
<OTHER-INCOME> 0
<EXPENSES-NET> 237
<NET-INVESTMENT-INCOME> (229)
<REALIZED-GAINS-CURRENT> 5,284
<APPREC-INCREASE-CURRENT> (3,788)
<NET-CHANGE-FROM-OPS> 1,267
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 189
<NUMBER-OF-SHARES-REDEEMED> (195)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 1,460
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
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<AVERAGE-NET-ASSETS> 24,013
<PER-SHARE-NAV-BEGIN> 16.94
<PER-SHARE-NII> (.18)
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<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 18.18
<EXPENSE-RATIO> 2.00
</TABLE>
