The Total School Cluster Grouping Model is a specific, research-based, total-school application of cluster grouping combined with differentiation, focused on meeting the needs of students identified as gifted while also improving teaching, learning, and achievement of all students. <br><br>This revised and updated second edition of Total School Cluster Grouping and Differentiation includes rationale and research followed by specific steps for developing site-specific applications that will make the important art of differentiation possible by reducing the range of achievement levels in teachers' classrooms. Materials to support staff development-including powerful simulations, evaluation, management, special populations, differentiation strategies, social and emotional needs, and recommended materials-are included.