Intellectual disabilities have various causes and effects. This interdisciplinary book addresses the complex issues through a balanced presentation of different aspects. In well-founded contributions, doctors, psychologists, educators, and legal experts provide detailed answers to practical questions. This lays the groundwork for the education, support, and treatment of people with intellectual disabilities and highlights perspectives for community living. The 4th edition builds on the success of previous editions. New in this edition are chapters on substance abuse, sexuality, caregiving responsibilities, aging issues, as well as forensic questions and problems.