This much-needed guide shows how to implement positive behavior support (PBS) strategies in secondary settings, using a three-tiered approach. The authors adapt the core ideas of PBS to the developmental context of adolescence and the organizational structures of middle schools and junior and senior high schools. With an emphasis on data-based decision making, the book provides ideas and examples for meeting the behavioral needs of all students, from those with emerging concerns to those with ongoing, chronic problems. It takes practitioners step by step through planning, implementing, evaluating, and sustaining schoolwide, small-group, and individual interventions. In a convenient large-size format, the book includes useful reproducible forms. This book is in The Guilford Practical Intervention in the Schools Series, edited by Sandra M. Chafouleas.