The author discusses the subject of self-harm in adolescence, considering the historical context of the development of its classification system. She presents an overview of theoretical fundamentals as well as models of behavior derived from them. Within the context of current research studies, she describes its prevalence, etiology, and comorbidity. The author specifies the basic protective and risk factors as well as all important influences. She presents the diagnostic tools currently used in research and clinical practice including the description of key approaches to prevention, therapy...