Peer support and social relationships have a tremendous influence on development, motivation, and achievement for all students, including struggling learners and those with disabilities. This highly practical book is one of the few resources available to guide classroom teachers and special educators in the application of peer-assisted instructional strategies in grades K-12. Expert contributors describe evidence-based approaches for building students' skills in reading, writing, math, and other content areas, as well as social competence and executive functioning. Sample lessons and more than a dozen reproducible tools are provided.