This book provides an interdisciplinary perspective on theory, research, and applications in human behavior change. Chapters from clinical, developmental, and community psychology and education are united by common principles and an emphasis on culture and context. The contributions of Roland Tharp to each of these fields are highlighted. The roles of parents, teachers, peers, families, schools, and neighborhoods are explored. Topics include behavior therapy, child development and culture, community programs, delinquency prevention, youth mentoring, instructional conversation, school reform, teacher professional development, and culturally relevant instruction. For each topic, new research challenges are identified.