Beginning with the theoretical perspectives that guide research on social influences, this book presents foundational research before moving on to chapters on peer influence and teacher influence. Next, the book addresses ways in which the school context can influence school-related outcomes (including peer and teacher-student relationships) with specific attention to research in motivation and cognition. Within the chapters authors not only present current research but also explore best-practices, drawing in examples from the classroom. With chapters from leading experts in the field, provides the first complete resource on this topic.