EXHIBIT 21.1 SUBSIDIARIES OF REGISTRANT STATE/COUNTRY OF INCORPORATION AICC Consultores, S.A. Chile AICC Consultores, S.A. Argentina AICC Technology, S.A. Argentina Computer & Communications Information New Jersey Group, Inc. (dba Datapro Information Services) Dataquest (Korea), Inc. Delaware Dataquest Australia Pty. Ltd. Australia Dataquest, Incorporated California Decision Drivers, Inc. Delaware DQ Research Pte, Ltd. Singapore G-Fund, L.L.C. Delaware G.G. Canada, Inc. Delaware G.G. Credit, Inc. Delaware G.G. Global Holding, Inc. Delaware G.G. Investment Management, Inc. Delaware G.G. Properties, Inc. Delaware G.G. Properties, Ltd. Bermuda G.G. West Corporation Delaware Gartner Credit Corporation Delaware Gartner Enterprises, Ltd. Delaware Gartner Group Advisory (Singapore) Singapore PTE Ltd. Gartner Group Asia, Inc. Delaware Gartner Group Canada Co. Canada Gartner Group DO Brasil, S/C Ltda. Brazil Gartner Group Europe Holdings, B.V. The Netherlands Gartner Group Europe, Inc. Delaware Gartner Group France S.A.R.L. France Gartner Group FSC, Inc. Virgin Islands Gartner Group Hong Kong, Ltd. Hong Kong Gartner Group Italia, S.r.L. Italy Gartner Group Japan K.K. Japan Gartner Group Nederland B.V. The Netherlands Gartner Group Norge A/S Norway Gartner Group Pacific Pty Limited Australia Gartner Group Research (Thailand) Ltd. Thailand Gartner Group Scandinavia A/S Denmark Gartner Group Sverige AB Sweden Gartner Group Switzerland AG Switzerland Gartner Group Taiwan Ltd. Taiwan Gartner Group UK Ltd. United Kingdom Gartner Group, GmbH Germany New Science Associates, Ltd. Ireland New Science Limited United Kingdom The Research Board Delaware View Acquisition Company Delaware Vision Events International, Inc. Delaware