This document discusses the evidence behind social and emotional learning (SEL) programs in schools. It outlines that SEL programs are most effective when they take a whole-school approach, focus on developing relationships and participation, and provide clarity and autonomy. Recent research shows that well-designed SEL interventions can positively impact students' social/emotional skills, behavior, and academic achievement, as well as teacher retention and performance. Key ingredients of successful programs include sound theory, a supportive school environment, skill development, parental partnerships, high-quality implementation, and monitoring/evaluation.