Presents a group critic system for object-oriented analysis and design. A group critic system is a critiquing system which is aware that the problems it finds in the design are the result of different users acting on different goals, and all are responsible for the problem. The environment also integrates a construction kit and an argumentative hypermedia system. We used annotation to point out criticisms, so that users can view the critiquing system as a true colleague. Annotations are also used as the cooperation medium among the designers.