<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Walker
Interactive Systems, Inc. annual report on Form 10-K for the year ended December
31, 1996 and the quarterly reports on Form 10-Q for the periods ended June 30,
1996 and September 30, 1996 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996
<PERIOD-START>                             JAN-01-1996             JAN-01-1996             JAN-01-1996
<PERIOD-END>                               DEC-31-1996             JUN-30-1996             SEP-30-1996
<CASH>                                          13,475                  15,025                  13,675
<SECURITIES>                                    24,695                  24,117                  22,981
<RECEIVABLES>                                   13,829                  12,855                  15,177
<ALLOWANCES>                                     1,584                   1,488                   1,604
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                44,345                  46,101                  44,325
<PP&E>                                          21,673                  20,017                  20,489
<DEPRECIATION>                                  17,341                  15,846                  16,471
<TOTAL-ASSETS>                                  82,319                  81,056                  81,329
<CURRENT-LIABILITIES>                           28,007                  27,097                  26,968
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                            13                      13                      13
<OTHER-SE>                                      46,759                  46,335                  46,535
<TOTAL-LIABILITY-AND-EQUITY>                    82,319                  81,056                  81,329
<SALES>                                         62,834                  29,708                  45,677
<TOTAL-REVENUES>                                62,834                  29,708                  45,677
<CGS>                                           28,732                  13,258                  20,580
<TOTAL-COSTS>                                   64,818                  32,744                  48,252
<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0
<INCOME-PRETAX>                                     86                  (2,054)                 (1,091)
<INCOME-TAX>                                       202                     103                     152
<INCOME-CONTINUING>                                  0                       0                       0
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                      (116)                 (2,157)                 (1,243)
<EPS-PRIMARY>                                    (0.01)<F1>              (0.16)<F1>              (0.09)<F1>
<EPS-DILUTED>                                    (0.01)                  (0.16)                  (0.09)
        

<FN>
<F1> BASIC EARNINGS PER SHARE ARE REPORTED UNDER EDGAR TAG "EPS-PRIMARY".
</FN>

</TABLE>