The definitive guide to autism and related conditions, with in-depth multidisciplinary coverage spanning clinical, developmental, biological, social, and public health perspectives The Handbook of Autism and Pervasive Developmental Disorders is the most influential reference work in the field of autism and related conditions. This Fifth Edition reflects updated diagnostic frameworks in the DSM-5 and ICD-11, as well as evolving societal perspectives on autism. Across two volumes, it addresses evolving and emerging topics such as gene-environment interactions, theoretical frameworks, developmental neurobiology, mental health care, clinical assessment, gender and minority issues, naturalistic developmental behavioral interventions, new learning technologies, economic aspects, and interactions with the law. Volume One: Diagnosis, Development, and Brain Mechanisms offers authoritative coverage of the diagnostic, developmental, and neurobiological aspects of autism, alongside its genetic, environmental, biochemical, social, medical and theoretical dimensions. Volume Two (available separately), covers assessment, interventions, and policy ramifications. Scholars, students and practitioners in psychology, medicine, special education, public health and related fields will appreciate this thorough update for the authoritative guide to autism and related conditions. It is a must-read resource discussing scientifically validated approaches to understanding and supporting individuals on the autism spectrum.