The quality of interpersonal relationships materially affects the outcome of encounters between teachers and administrators. The supervisor will, therefore, achieve the greatest overall success if he is supportive in his leadership style. His performance depends, too, on technical competence and managerial ability. There is a need for more creative courses in the training of supervisors with such qualities. Since nonverbal behaviors play such an important part in interpersonal relationships, the supervisee and his supervisor should agree on the validity of the observation instruments and methods to be used. At the same time, however, systems approach theories have a role to play in planning and diagnosis, and in the formulation of supervisory conference strategies. (Author)