"This very practical guide models what it advocates. It is rooted in clear and worthy learning goals for readers. It guides teachers in exploring, understanding, and applying those goals, and it provides plenty of scaffolding for teachers at varied entry points in thinking about differentiation, rigor, and the relationship between the two. Its hallmark is its approachable, user-friendly tone and language. It’s a teacher talking to other teachers!" --Carol Ann Tomlinson, William Clay Parrish, Jr. Professor & Chair of Educational Leadership, Foundations, and Policy, Curry School of Education, University of Virginia