<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM DELTEK
SYSTEMS, INC. FINANCIAL STATEMENTS INCLUDED IN THE COMPANY'S STATEMENT ON FORM
10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS
AND NOTES THERETO.
</LEGEND>
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JUL-01-1997             JAN-01-1997
<PERIOD-END>                               SEP-30-1997             SEP-30-1997
<CASH>                                           3,749                       0
<SECURITIES>                                    17,732                       0
<RECEIVABLES>                                    8,383                       0
<ALLOWANCES>                                     (472)                       0
<INVENTORY>                                        143                       0
<CURRENT-ASSETS>                                31,551<F1>                   0
<PP&E>                                          24,869                       0
<DEPRECIATION>                                 (2,643)                       0
<TOTAL-ASSETS>                                  36,499<F2>                   0
<CURRENT-LIABILITIES>                           14,247                       0
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            17                       0
<OTHER-SE>                                      22,235                       0
<TOTAL-LIABILITY-AND-EQUITY>                    36,499                       0
<SALES>                                         12,580                  34,572
<TOTAL-REVENUES>                                12,580                  34,572
<CGS>                                                0                       0
<TOTAL-COSTS>                                    8,554                  23,454
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                                  4,248<F3>              11,636<F4>
<INCOME-TAX>                                     1,610                   3,566<F5>
<INCOME-CONTINUING>                              4,026                  11,118
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     2,638                   8,070<F5>
<EPS-PRIMARY>                                     0.15                       0<F5>
<EPS-DILUTED>                                        0                       0
<FN>
<F1>INCLUDES PREPAID EXPENSES AND OTHER CURRENT ASSETS OF 2,016.
<F2>INCLUDES COMPUTER SOFTWARE COSTS-NET OF 2,593. ALSO EXCLUDES OTHER ASSETS OF
    129.
<F3>INCLUDES INTEREST INCOME OF 222.
<F4>INCLUDES INTEREST INCOME OF 518.
<F5>AS A SUBCHAPTER "S" CORPORATION PRIOR TO THE PUBLIC OFFERING, THE PROFORMA
    INCOME TAX PROVISION, PROFORMA NET INCOME AND PROFORMA NET INCOME PER SHARE
    WAS 4,448, 7,188, AND $0.42 PER SHARE.
</FN>