EXHIBIT 21.1

SUBSIDIARIES OF MERCURY INTERACTIVE CORPORATION

Subsidiary Legal Name	JURISDICTION OF INCORPORATION
Mercury Interactive Austria GesmbH	Austria
Mercury Interactive Brasil Ltda.1	Brazil
Mercury Interactive Canada, Inc.	Canada
Mercury Interactive A/S	Denmark
Mercury Interactive Oy	Finland
Mercury Interactive France2	France
Mercury Interactive (Hong Kong) Ltd.3	Hong Kong
Mercury Interactive (HK) Ltd. Beijing	Beijing
Mercury Interactive Sales and Service India Private Limited4	India
Mercury Interactive (Israel) Ltd.	Israel
Mercury Interactive (Australia) Pty. Limited5	Australia
Mercury Interactive S.r.L (Italy)6	Italy
Mercury Interactive Japan KK	Japan
Mercury Interactive Luxembourg SA7	Luxembourg
Mercury Interactive Mexico S. de R.L. de C.V.8	Mexico
Mercury Interactive (Europe) B.V.	Netherlands
Mercury Interactive GmbH	Germany
Mercury Interactive (UK) Limited	UK
Mercury Interactive B.V.	Netherlands
Mercury Interactive Poland Sp z oo	Poland
Mercury Interactive (Singapore) Pte. Ltd.	Singapore
Mercury Interactive (Shanghai) Company Ltd.	China
Mercury Interactive India Liaison Office	India
Mercury Interactive SA (Pty) Limited	South Africa
Mercury Interactive (Korea) Co. Ltd.	South Korea
Mercury Interactive, S.L. Unipersonal	Spain
Mercury Interactive Nordic AB	Sweden
Mercury Interactive (Switzerland) GmbH	Switzerland
Mercury Interactive Freshwater, Inc.	Delaware
Mercury Interactive Government Solutions, Inc.	Delaware
Mercury Interactive Partners LLC	Delaware
Mercury Interactive Ventures LP9	Delaware
Double B Acquisition Corp.	Delaware
ClickCadence, LLC	Pennsylvania
Kanga Acquisition LLC	Delaware
Kintana SARL	France
Kintana GmbH	Germany
Kintana Limited	UK

SUBSIDIARY LEGAL NAME	JURISDICTION OF INCORPORATION
Performant, Inc.	Delaware
Systinet Corporation	Delaware
Systinet S.R.O.	Czechoslovakia
Systinet SAS	France
Systinet Nederland B.V.	Netherlands
Tefensoft Inc.	Delaware
Tefensoft Ltd.	Israel

(1) 99% interest owned by Mercury Interactive Corporation and 1% interest owned by Mercury Interactive Canada, Inc.

(2) 81% interest owned by Mercury Interactive Corporation and 19% interest owned by Mercury Interactive (Europe) B.V.

(3) 99% interest owned by Mercury Interactive Corporation and 1% interest owned by Mercury Interactive B.V.

(4) 99% interest owned by Mercury Interactive Corporation and 1% interest owned by Mercury Interactive (Singapore) Pte. Ltd.

(5) 50% interest owned by Mercury Interactive Corporation and 50% interest owned by Mercury Interactive (Israel) Limited

(6) 95% interest owned by Mercury Interactive Corporation and 5% interest owned by Mercury Interactive B.V.

(7) 75% interest owned by Mercury Interactive Corporation and 25% interest owned by Mercury Interactive B.V.

(8) 99% interest owned by Mercury Interactive Corporation and 1% interest owned by Mercury Interactive Freshwater, Inc.

(9) 99% interested owned by limited partner Mercury Interactive Corporation and 1% interest owned by general partner Mercury Interactive Partners LLC