cy Leveson, Sept. 199 Stage 4: Performing Members experience insight into personal and Interpersonal processes Constructive self-change occurs Great deal of work accomplished Team becomes capable of diagnosing and solving problemsCopyright Nancy Leveson, Sept. 1999 c Stage 4: Performing Members experience insight into personal and interpersonal processes. Constructive self-change occurs. Great deal of work accomplished. Team becomes capable of diagnosing and solving problems. �