The newest edition of the most comprehensive handbook on autism and related disorders Since the original edition was first published more than a quarter-century ago, The Handbook of Autism and Pervasive Developmental Disorders has been the most influential reference work in the field. The new, updated Fourth Edition includes the changes in the way the disorder is defined  in the DSM5 and ICD-10 that may have profound implications for diagnosis and, by extension, access to services. Along with providing practical clinical advice—including the role of psychopharmacology in treatment—the handbook codifies the ever-expanding current body of research throughout both volumes. Volume 1 Offers a wealth of information on the epidemiology of autism and the genetic, environmental, biochemical, social, and neuropathological aspects of the disorderCovers descriptive and diagnostic characteristics, biological contributions, intervention techniques, as well as legal and social issuesdiscusses outcomes in adults with autism spectrum disorders; issues and interventions important from infancy through adolescence to adulthood; play development,; and psychopharmacology and medical care in autism and related conditions Volume 2 Focuses on three areas of autism studies: Assessment, including screening for autism in young children, diagnostic instruments, clinical evaluation, and behavioral assessment;Interventions for infants and toddlers at risk, treatment models for children and youth with ASD; and Social Policy Perspectives such as supporting independence in the community for individuals with high functioning ASD, supporting the family of people with ASD, and evidence-based psychosocial interventionsPolicy and Special topics include autism across cultures, autism in the classroom, alternative treatments, teacher and professional training guidelines, and economic aspects of autism Providing a comprehensive review of all information presently available about autism and pervasive developmental disorders, this invaluable, two-volume reference work brings readers up to date on the abundance of research conducted and published since the previous edition.