This book presents detailed descriptions of alternative types of block schedules and discusses their effects on teachers and students. The book shows administrators how to organize their schools so that time enhances instruction and fosters learning. Chapter 1 discusses problems with the traditional high school schedule and chapter 2 provides information on alternate-day block schedules. Chapter 3 offers suggestions for implementing the 4/4 semester plan. More intensive schedules, such as the quarter-on/quarter-off plan, the trimester model, and the Copernican Plan, are described in chapter 4. The fifth chapter describes varieties of instructional terms within the 180-day school year. Models for blending scheduling models are provided in the sixth chapter. Chapter 7 explains schedules that extend teacher planning and professional-development opportunities. Instructional strategies and tips for designing a staff-development plan are discussed in chapter 8. Appendices contain an evaluation matrix, a planning checklist for alternative scheduling for high schools, and a list of achievement indicators for high-school restructuring efforts. (Contains 172 references.) (LMI)