This comprehensive guide provides extensive clinical description of the Multisystemic Treatment (MST) approach for treating youths with serious antisocial behavior. A proven alternative to expensive and often ineffective out-of-home placement, MST is a family- and community-based treatment. It focuses on ameliorating the known determinants of antisocial behavior within the young person's family, peer, and school networks. Nine core principles comprise the parameters for the book's flexible, team-based intervention framework, which targets such areas as promoting family strengths and resiliencies, removing youths from antisocial peer groups, enhancing school performance, and developing indigenous social support systems. The book features a wealth of illustrative case material and is extensively documented with findings from controlled outcome studies.