EXHIBIT 21.1

LIST OF WHOLLY OWNED SUBSIDIARIES

RATIONAL SOFTWARE CORPORATION

Name	Jurisdiction of Incorporation
Rational Software Holdings LLC	Delaware
Rational Software Technology Corporation	Delaware
Rational SPC LLC	Delaware
RSFO, LLC	Delaware
Rational International	California
Rational Software Canada Co.	Canada
3037936 Nova Scotia Company	Canada
1386501 Ontario Limited	Canada
Rational Software do Brasil Ltda.	Brazil
Rational Software S.A. de C.V.	Mexico
Rational Software Limited	United Kingdom
Rational Software Sarl	France
Rational Software GmbH	Germany
Rational Software B.V.	Netherlands
Rational Software C.V.	Netherlands
Rational Software N.V.	Belgium
Rational Software Nordic AB	Sweden
Rational Software Finland Oy	Finland
Rational Software Norway AS	Norway
Rational Software Denmark A/S	Denmark
Rational Software Schweiz GmbH	Switzerland
Rational Software s.r.l.	Italy
Rational Software Austria GmbH	Austria
Rational Software Spain S.R.L.	Spain
Rational Software Ireland Limited	Ireland
Rational Holding Sarl	France
Rational Software S.A.	France
Rational Software Israel Ltd.	Israel
Rational Software Pty Ltd.	Australia
Rational Software Pte Ltd.	Singapore
Rational Software Korea Ltd.	Korea
Rational Software Corp. (India) Pvt. Ltd.	India
Rational Software New Zealand	New Zealand
Rational Software Greater China Ltd.	Hong Kong
Nihon Rational Software K.K.	Japan
Rational Software Sdn Bhd	Malaysia
Rational Software Consulting (Shanghai) Co., Ltd.	China
Rational Software Technology Ltd.	Cayman Islands