Abstract
This paper presents a method that one holonic subsystem in the overall system can recognize separation from a, group. To remain in the group is a complemental event to the separation. After each subsystem has listened to the others' chats, it always broadcasts what could be caught. One subsystem can contact with the others if they make a directed closed-loop in the graphic network of the system. And then, those subsystems make up a group. One can look for the directed closed-loop by the reachability matrix which is built from the listeners' status. The experiment using microcomputers shows that this method is useful for the recognition of separation from group.
