EXHIBIT 21.01 INTEGRATED SYSTEMS, INC. LIST OF REGISTRANT'S SUBSIDIARIES State or Jurisdiction of Incorporation or Name Organization ----------------------------------- ------------------------- Integrated Systems, Inc. F.S.C U.S. Virgin Islands Integrated Systems, Inc. Limited United Kingdom Integrated Systems, Inc. S.A. France Integrated Systems, GmbH Germany Integrated Systems, Inc. A.B. Sweden Integrated Systems (Israel) Ltd. Israel Integrated Systems, Inc. GmbH Austria TakeFive Software GmbH Austria TakeFive Software AG Switzerland TakeFive Software, Inc. California TakeFive Software, Ltd. United Kingdom Doctor Design, Inc. California ISICAN Integrated Systems (Canada) Inc. Canada Integrated Systems Japan K.K. Japan Integrated Systems, Inc. Italia SRL Italy Epilogue Technology Corporation New Mexico Diab Data, Inc. California 50