Just because a school has adopted a social and emotional learning (SEL) program does not mean it will work. This book explores the conditions needed to implement, strengthen, and sustain effective SEL, and identifies paths that schools, districts, and states have taken to create those conditions. Major themes include equity of access to high-quality SEL, promoting interracial understanding in all school interactions, and enhancing the well-being and SEL skills of teachers and school leaders as well as students. Chapters describe exemplary initiatives that infuse SEL into classroom instruction, administrative decision making, school–family–community partnerships, and teacher training. End-of-chapter discussion questions enhance the book’s value for professional learning and course use.