<PAGE>
EXHIBIT 21
COMPUTER SCIENCES CORPORATION
Significant Active Subsidiaries and Affiliates
As of March 31, 2000
<TABLE>
<CAPTION>
Jurisdiction
of
Name Organization
---- ------------
<S> <C>
Advanced Marine Enterprises, Inc. Virginia
Aerospace Center Support (Partnership) Tennessee
Alliance-One Services, Inc. Delaware
Automated Systems (HK) Limited Hong Kong
Century Corporation Nevada
Computer Sciences Canada Inc. Canada
Computer Sciences Corporation Administration Services (Pty)
Limited South Africa
Computer Sciences Corporation Continuum--Informatica, Lda Portugal
Computer Sciences Gestion S.A. France
Computer Sciences International A/S Norway
Computer Sciences Raytheon (Partnership) Florida
Computer Systems Advisers (M) Bhd Malaysia
Continuum (Deutschland) GmbH Germany
Continuum Direct Limited United Kingdom
Credit Bureau of Tulsa, Inc. Oklahoma
CSA Automated Private Limited Singapore
CSC Accounts Management, Inc. Texas
CSC Asset Management Inc. Nevada
CSC Australia Pty. Limited Australia
CSC Computer Sciences (South Africa)(Pty) Limited South Africa
CSC Computer Sciences B.V. Netherlands
CSC Computer Sciences Consulting Austria AG Austria
CSC Computer Sciences HK Limited Hong Kong
CSC Computer Sciences Iberica, S.A. Spain
CSC Computer Sciences Ireland Limited Ireland
CSC Computer Sciences Italia S.p.A. Italy
CSC Computer Sciences Limited United Kingdom
CSC Computer Sciences N.V./S.A. Belgium
CSC Computer Sciences Pte Limited Singapore
CSC Computer Sciences S.A. France
CSC Computer Sciences S.A. Luxembourg
CSC Computer Sciences s.r.o. Czech Republic
CSC Computer Sciences SARL Switzerland
CSC Computer Sciences Sdn Bhd Malaysia
CSC Computer Sciences Services Management GmbH Germany
CSC Computer Sciences spol. s.r.o. Slovakia
CSC Computer Sciences VOF/SNC (Partnership) Belgium
CSC Consulting B.V. Netherlands
CSC Consulting, Inc. Massachusetts
CSC Corporation Limited United Kingdom
CSC Credit Services, Inc. Texas
CSC Danmark A/S Denmark
CSC Domestic Enterprises, Inc. Nevada
CSC Energy Services, Inc. Nevada
CSC Enterprises (Partnership) Delaware
CSC Enterprises, Inc. Nevada
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
Jurisdiction
of
Name Organization
---- ------------
<S> <C>
CSC Financial Services Canada Inc. Canada
CSC Financial Services GmbH Germany
CSC Financial Services Limited United Kingdom
CSC Financial Services S.A. France
CSC Foreign Sales Corporation Barbados
CSC FSG Limited United Kingdom
CSC Geographic Technologies Inc. Nevada
CSC Healthcare Inc. California
CSC Infogerance S.A. France
CSC Informatica S.p.A. Italy
CSC Information Systems A/S Denmark
CSC Information Technology Solutions Limited New Zealand
CSC Information Technology Solutions Pty Ltd Australia
CSC Integrated Payments B.V. Netherlands
CSC International Systems Management Inc. Nevada
CSC Investment Services Management Limited United Kingdom
CSC Japan, Ltd. Delaware
CSC Kobra B.V. Netherlands
CSC Logic, Inc. Texas
CSC New Zealand Limited New Zealand
CSC Outsourcing Inc. Nevada
CSC Peat Marwick S.A. France
CSC Pergamon GmbH Germany
CSC Ploenzke (Austria) GmbH Austria
CSC Ploenzke (Schweiz) AG Switzerland
CSC Ploenzke AG Germany
CSC Ploenzke IT--Services GmbH Germany
CSC Ploenzke, S.A. Spain
CSC PMF S.A. France
CSC Professional Services Group, Inc. Maryland
CSC Services Management B.V. Netherlands
CSC Services No. 1 Limited United Kingdom
CSC Servodata GmbH Austria
CSC Sverige AB Sweden
CSC Veneto S.p.A. Italy
Elabora Media SRL Italy
Eleda Informatica SRL Italy
Key Choice Insurance Marketing Limited United Kingdom
Mississippi Space Services (Partnership) Mississippi
Mnemonic Systems, Inc. Virginia
NCCIM, LLC Delaware
Nichols InfoTec Corporation Delaware
Nichols Research Corporation Delaware
Nichols TXEN Corporation Delaware
NRC Technical Services Company Alabama
Paxus Australia Pty. Limited Australia
Paxus Broker Services Pty. Limited Australia
Paxus Corporation Limited New Zealand
Paxus Financial R&D Pty. Limited Australia
PT. CSC Computer Sciences Indonesia
Sys-Aid Beheer B.V. Netherlands
Welkin Associates, Ltd Virginia
</TABLE>
