What are the historical foundations of autism and what precisely is meant by the ′autistic spectrum′? How can we explain behavioural patterns of people with autism, young or old, and what are the major theoretical bases for understanding these? What is the latest thinking regarding diagnosis, and what are the most effective strategies for assessment, education and care for people on the autistic spectrum? From historical information to methods of assessment, and from intervention to education and support, this informative and accessible text explores theories at the psychological, neurobiological and ′first cause′ levels. This fully up to date Third Edition answers these questions with a strong practical focus, encompassing the latest research on autistic spectrum disorders. New features include: Further reading suggestions Glossary of technical terms Updated information on autism support services Personal illustrative examples Jill Boucher is a retired academic psychologist.  Her most recent post was Professor of Developmental Psychology at City, University of London.