Going beyond other bullying prevention resources, this book presents an approach grounded in evidence-based best practices, together with concrete guidance for weaving it sustainably into the fabric of a school. The authors describe a range of ways to support the development of prosocial skills in K12 students, make data-based decisions to respond to bullying, and build partnerships across students, staff, and families. Of crucial importance, the book explains how to ensure that bullying prevention efforts are implemented with fidelity and do not fade away over time. An in-depth case study illustrates what effective implementation looks like in the school setting. The large-size format facilitates photocopying; reproducible tools to support implementation can be downloaded and printed for repeated use. This book is in The Guilford Practical Intervention in the Schools Series, edited by Sandra M. Chafouleas.