Multisystemic therapy (MST) has grown dramatically since the initial publication of this comprehensive manual. Today, over 400 MST programs operate in more than 30 states and 10 countries, supported by a strong empirical evidence base. This book explains the principles of MST and provides clear guidelines for clinical assessment and intervention with delinquent youth and their families. Practitioners are guided to implement proven strategies for engaging clients and helping them to address the root causes of antisocial behavior, improve family functioning and peer relationships, enhance school performance, and build meaningful social supports. New to This Edition*Thoroughly revised and expanded to include the latest MST data and clinical refinements. *Revised to be even more user-friendly, with many new examples added. *A chapter on treating youth and caregiver substance abuse.*Expanded coverage of safety concerns, enhancing vocational outcomes, and MST adaptations for other clinical problems.*A chapter detailing the MST system for sustaining high-quality programs.