This professional text covers every aspect of Autistic Spectrum Disorders (ASD), from science to services, from the most disabling Kanner's syndrome to the most high-functioning Asperger syndrome, and from birth to old age. The book contains the latest research on the assessment, diagnosis, treatment, intervention and support of individuals with ASD, and examines their implications at various stages of life. A wide range of neurological, genetic, psychological, developmental, social, and emotional issues are covered, and the author also includes less accessible information on the diagnosis and treatment of associated psychiatric and medical conditions, the overlap between the ASDs and attention deficit hyperactivity disorder, and the management of behavioural and forensic problems. The author does not presume existing technical knowledge and the background to new methods of assessment, such as functional magnetic resonance imaging, standardized clinical and psychological assessment, and genetic testing, is explained. This book is a resource for working with individuals of all ages who are on the autism spectrum. It contains research into the causes and treatment of the disorder.