The authors argue persuasively that differentiation provides diverse learners with access to the curriculum and an invitation to learn. The first four chapters describe the foundations of effective teacher differentiation: knowing each student as a learner, knowing one's curriculum, developing a repertoire of research-based instructional strategies, and learning the skills of professional collaboration. Embedded in each chapter are practical strategies that teachers can use in their classrooms. Later chapters deal with special issues in differentiation, such as assessment, teacher cultural sensitivity, the International Baccalaureate Diploma Program and the use of classroom technology. The authors write from their perspective as career international educators.