A description is given of the activities that occurred during the initial three years of planning and implementing a staff development program aimed at effective teaching and supervision in the Glendale, California, Unified School District. The report focuses on the third component of a five-year master plan, the planning and implementation of a staff development plan to assist teachers in refining instructional skills and to help school administrators in their role as instructional supervisors. The activities described are grouped into four key areas: (1) planning; (2) training; (3) follow-up; and (4) principal support. Each of these key areas represents an essential component of successful staff development practices substantiated by research. Twenty-one references are included. (JD)