The Pompidou Group's Working Group on Treatment focuses on the treatment of young drug users. The publication contains the following chapters: Definitions of dependency and recreational, regular, problematic, harmful drug use; Epidemiological basis; Risk and protective factors in adolescent and youth drug use; How to establish contact with young people who use drugs; Screening and assessment; Treatment and treatment planning; Co-morbidity of substance abuse: diagnosis and treatment implications in adolescents; Treatment considerations for pregnant drug users. Also contains summary, conclusion and recommendations.