EXHIBIT 21.1 COMPUWARE CORPORATION AND SUBSIDIARIES SUBSIDIARIES OF THE REGISTRANT AS OF MARCH 31, 2005 NAME JURISDICTION OF INCORPORATION - ---- ----------------------------- Compuware A.B............................................................... Sweden Compuware AG................................................................ Switzerland Compuware Nordic AS......................................................... Norway Compuware A/S............................................................... Denmark Compuware Asia-Pacific Holdings Ltd......................................... Hong Kong Compuware Asia Pacific Limited.............................................. Hong Kong Compuware Asia Pacific Pte. Ltd............................................. Singapore Compuware Asia-Pacific Pty. Ltd............................................. Australia Compuware B.V............................................................... Netherlands Compuware Corporation of Canada............................................. Canada Compuware de Mexico......................................................... Mexico Compuware do Brasil S/A..................................................... Brazil Compuware Europe B.V........................................................ Netherlands Compuware Foreign Sales Corporation......................................... Barbados Compuware Global Services, Inc.............................................. Michigan Compuware Austria GmbH...................................................... Austria Compuware International I LLC............................................... Michigan Compuware Japan Corporation................................................. Japan Compuware Korea Ltd......................................................... Korea Compuware Ltd............................................................... United Kingdom Compuware NV/SA............................................................. Belgium Compuware Overseas Holding Corporation...................................... Michigan Compuware S.A............................................................... Spain Compuware S.A.R.L........................................................... France Compuware GmbH.............................................................. Germany Compuware System Software B.V............................................... Netherlands Compuware SpA............................................................... Italy Reliant Data Systems Inc. .................................................. Delaware Changepoint International SRL............................................... Barbados Changepoint France SARL..................................................... France Changepoint EMEA SARL....................................................... France