This text, with accompanying Workbook, provides step-by-step guidelines to relapse prevention with adult male child sex abusers, using a cognitive-behavioural treatment approach in community-based, secure hospital and prison sex offender programs. It discusses the theoretical base for relapse prevention, and includes information on : the relapse process and its implications for assessment of perpetrator patterns; intervention in those patterns and maintenance of change; rationale for the exercises used in each phase; how to introduce the exercises; how to deal with client questions and resistance; and different ways of explaining the materials. It also includes sample therapist/client dialogue.