Multiage is an instructional design whereby students from two or more grades are blended together into a learning community that progresses with the same teacher(s) for two or more years. This book was designed to help teachers and administrators explore, implement, and evaluate their multiage program. The book is presented in four parts. The first three parts share a consistent format and include a series of checklists and charts for participating educators to complete. Part 1, "Exploring the Multiage Classroom," examines the multiage classroom, reasons for its implementation, and the kinds of instructional practices commonly associated with it. Part 2, "Implementing the Multiage Classroom," presents the steps involved in planning the instructional design associated with a multiage classroom. Part 3, "Evaluating the Multiage Classroom," provides assistance in establishing an evaluation process for the multiage instructional design, clarifying the elements to be evaluated and how the results should be used, shared, and reported. Part 4, "Support Pages," contains reproducible forms and sample letters, questionnaires, and surveys, ready for revision or immediate use. The final section also provides recommended resources for further information. (KB)