<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ONESOURCE
INFORMATION SERVICES, INC.'S CONSOLIDATED BALANCE SHEET  FOR MARCH 31, 2000 AND
CONSOLIDATED STATEMENT OF OPERATIONS FOR THE THREE MONTHS ENDED MARCH 31, 2000
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               MAR-31-2000
<EXCHANGE-RATE>                                      1
<CASH>                                          16,147
<SECURITIES>                                         0
<RECEIVABLES>                                    8,966
<ALLOWANCES>                                       344
<INVENTORY>                                         55
<CURRENT-ASSETS>                                31,449
<PP&E>                                           6,951
<DEPRECIATION>                                   3,155
<TOTAL-ASSETS>                                  45,527
<CURRENT-LIABILITIES>                           32,719
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           110
<OTHER-SE>                                      12,693
<TOTAL-LIABILITY-AND-EQUITY>                    45,527
<SALES>                                         11,558
<TOTAL-REVENUES>                                11,558
<CGS>                                            4,501
<TOTAL-COSTS>                                    4,501
<OTHER-EXPENSES>                                 8,610
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                (26)
<INCOME-PRETAX>                                  (883)
<INCOME-TAX>                                        20
<INCOME-CONTINUING>                              (903)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     (903)
<EPS-BASIC>                                     (0.08)
<EPS-DILUTED>                                   (0.08)