Summary: Fully revised, this new edition reviews the most up-to-date and clinically relevant information on the mental health and behavioral problems of people with intellectual, developmental and learning disabilities, also previously known as mental retardation. Providing the latest evidence base from the literature and embracing clinical experience, it covers the essential facts and concepts relating to coexisting medical and psychiatric disorders, with new and updated chapters on mental health and epilepsy, schizophrenia spectrum disorders, personality disorders, and mental health problems in people with autism and related disorders. The disorder-based chapters are complemented by chapters on carer and family perspectives, possible future developments and contributions highlighting the principles of assessment, management and services from global and historical perspectives. This is essential hands-on practical advice for psychiatrists, psychologists and all other mental health professionals including nurses, therapists, social workers, managers, service providers and commissioners.