This is must-have startup document for anyone who needs the research grounds for classroom strategies in peer tutoring, peer editing, cooperative learning, jigsaw strategies, student presentations (when you expect the other students to learn the peer's presentation content). The authors, both teachers, combed hundreds of research reports for findings about K-12 peer teaching, and they boiled it down in easy-to-read topics related to the practice. For example: No, peer teaching does not hold high achievers back. Yes, elaborate explanations are better than simple ones. Much more, including a big bibliography.