<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS RESTATED SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
RESPECTIVE CONSOLIDATED BALANCE SHEETS AS OF DEC-31-1996 SEP-30-1996 JUN-30-1996
AND MAR-31-1996 AND THE RELATED STATEMENTS OF INCOME AND CASH FLOWS FOR THE
RESPECTIVE PERIODS THEN ENDED AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                           <C>                    <C>                     <C>                     <C>
<PERIOD-TYPE>                 YEAR                   9-MOS                   6-MOS                   3-MOS
<FISCAL-YEAR-END>                   DEC-31-1996             DEC-31-1996             DEC-31-1996             DEC-31-1996
<PERIOD-START>                      JAN-01-1996             JAN-01-1996             JAN-01-1996             JAN-01-1996
<PERIOD-END>                        DEC-31-1996             SEP-30-1996             JUN-30-1996             MAR-31-1996
<CASH>                                   62,483                  64,248                  59,669                  56,960
<SECURITIES>                                  0                       0                       0                       0
<RECEIVABLES>                            38,694                  21,536                  25,692                  23,275
<ALLOWANCES>                                  0                       0                       0                       0
<INVENTORY>                                 733                     860                     902                     991
<CURRENT-ASSETS>                        108,149                  92,395                  91,650                  86,790
<PP&E>                                   27,519                  27,608                  26,460                  24,395
<DEPRECIATION>                           14,784                  14,318                  12,577                  11,090
<TOTAL-ASSETS>                          127,154                 115,619                 116,347                 109,803
<CURRENT-LIABILITIES>                    36,351                  28,547                  29,407                  25,696
<BONDS>                                       0                       0                       0                       0
<PREFERRED-MANDATORY>                         0                       0                       0                       0
<PREFERRED>                                   0                       0                       0                       0
<COMMON>                                 54,357                  53,861                  52,568                  52,302
<OTHER-SE>                               36,446                  33,212                  34,372                  31,805
<TOTAL-LIABILITY-AND-EQUITY>            127,154                 115,619                 116,347                 109,803
<SALES>                                 139,364                  95,509                  64,682                  29,856
<TOTAL-REVENUES>                        139,364                  95,509                  64,682                  29,856
<CGS>                                    30,474                  21,786                  14,674                   6,649
<TOTAL-COSTS>                            30,474                  21,786                  14,674                   6,649
<OTHER-EXPENSES>                        103,829                  72,911                  47,340                  22,723
<LOSS-PROVISION>                              0                       0                       0                       0
<INTEREST-EXPENSE>                            0                      73                      68                       0
<INCOME-PRETAX>                           7,247                   2,462                   3,503                     824
<INCOME-TAX>                              3,054                     935                   1,331                     313
<INCOME-CONTINUING>                       4,193                   1,527                   2,172                     511
<DISCONTINUED>                                0                       0                       0                       0
<EXTRAORDINARY>                               0                       0                       0                       0
<CHANGES>                                     0                       0                       0                       0
<NET-INCOME>                              4,193                   1,527                   2,172                     511
<EPS-PRIMARY>                              0.46                    0.17                    0.24                    0.06
<EPS-DILUTED>                              0.43                    0.16                    0.22                    0.05
        

</TABLE>