During 1970-71 partial or full semester systems were in operation at different secondary schools. Principals, teachers, students, and parents from schools in each of three categories: partial semester plan, full semester plan with a static timetable schedule, and full semester plan with a rotating timetable schedule, were sent separate questionnaires which elicited their attitudes toward the various systems. The questionnaires, their results (a majority of which were favorable), and list of advantages and disadvantages of semestering are included. (AG)