We differentiate instruction to honor the reality of the students we teach. They are energetic and outgoing. They are quiet and curious. They are confident and self-doubting. They are interested in a thousand things and deeply immersed in a particular topic. They are academically advanced and "kids in the middle" and struggling due to cognitive, emotional, economic, or sociological challenges. More of them than ever speak a different language at home. They learn at different rates and in different ways. And they all come together in our academically diverse classrooms.Written as a practical guide for teachers, this expanded third edition of Carol Ann Tomlinson\'s groundbreaking work covers the fundamentals of differentiation and provides additional guidelines and new strategies for how to go about it.