How can today’s teachers, whose classrooms are more culturally and linguistically diverse than ever before, ensure that their students achieve at high levels? How can they design units and lessons that support English learners in language development and content learning—simultaneously? Authors Amy Heineke and Jay McTighe provide the answers by adding a lens on language to the widely used Understanding by Design framework (UbD framework) for curriculum design, which emphasizes teaching for understanding, not rote memorization. Student profiles, real-life classroom scenarios, and sample units and lessons provide compelling examples of how teachers in all grade levels and content areas use the UbD framework in their culturally and linguistically diverse classrooms. Combining these practical examples with findings from an extensive research base, the authors deliver a useful and authoritative guide for reaching the overarching goal: ensuring that all students have equitable access to high-quality curriculum and instruction.