It may seem contradictory at first glance that suicidality and non-suicidal self-injurious behavior are addressed in one volume, but experience shows that the dividing line is not as clear-cut as diagnostic classification systems suggest. This volume of the "Manuals of Child and Adolescent Psychiatry" presents the current state of research in a clear manner. Additionally, all practice-relevant aspects—from detailed diagnostics to various forms of therapy—are summarized. The series "Manuals of Mental Disorders in Children and Adolescents" pursues three essential goals: Interdisciplinary approach: The patient is at the center—therapists must do their best to diagnose and treat the disorder adequately. Child and adolescent psychiatrists, psychiatrists, and psychologists are called upon to apply their knowledge.