A three-stage model of instruction was used to coordinate the development of 13 areas of leadership instruction designed for use by high school vocational educators. Leadership literature was reviewed in order to identify the areas of leader and group member skills. A separate three-stage leadership unit and teachers' manual were developed for each leadership area. The field test consisted of a pretest-posttest, control-group design using a sample of 24 classrooms enrolling 550 vocational high school students. Formative evaluation results, based on statements obtained from field test teachers, were favorable and were used to guide revisions of the units. Summative evaluation results were gathered for the three stages of the units. Stage one results indicated that students who studied the leadership materials mastered more factual information than students in the control group. Stage two of each unit was judged successful in teaching students to apply and integrate knowledge about leadership skills. Stage three of each unit was successful in teaching students to use knowledge about leadership and to develop a personal attitude toward leadership. (CH)