Developed in association with the American Psychiatric Association, this manual provides extensive knowledge of mental disorders and intellectual disabilities to aid in psychiatric diagnosis. To combat the all too frequent problem of misdiagnosis, this book helps clinicians identify signs and symptoms of specific disorders, allowing for a more comprehensive and thorough diagnosis and ensuring that patients receive appropriate care. The manual represents the collaborative effort of a number of experts and is an invaluable tool in improving our understanding of mental disorders and their unique expression in those with intellectual disabilities.