Tetra Tech, Inc.. The Group's principal activity is to provide specialized management consulting and technical services. The Group operates through three segments: Resource management, Infrastructure and Communications. Resource management segment provides specialized environmental engineering and consulting services relating to water quality and availability. Infrastructure segment provides engineering services for development, upgrading and replacement of existing infrastructure. Communications segment provides engineering, consulting and field services. In fiscal 2002, the Group acquired The Thomas Group of Companies, Hartman and Associates, Inc. and Ardaman and Associates, Inc. Resource management accounted for 49% of fiscal 2002 revenues; Infrastructure, 36% and Communications, 15%.