This publication describes the development and operation of the scheduling plan developed by the Shrewsbury, Massachusetts, school system. The plan, designed to maximize the use of available facilities and to expand the curriculum offering, combines a fifty-hour instructional week, alternative learning opportunities throughout the community, an expanded curriculum of 200 course offerings on an elective trimester basis, late afternoon and evening classes, the near elimination of study halls, and visiting instructors for specialized subject areas. Pupils attend classes on a required basis four days a week during the A-Block Session (8 a.m. to 2 p.m.) and are encouraged to elect into the B-Block (2 p.m. to 5 p.m.) and C-Block (7 p.m. to 9 p.m.) classes. On the fifth day, pupils are encouraged to participate in a Career Opportunity Program in which they work in hospitals and schools as volunteer aides. (Author/DN)