This volume, the first in the series, explores the high-functioning group of people within the spectrum of autism disorders. It is the culmination of over a decade of clinical work and research, including the most up-to-date information available about this group at the beginning of the 21st century. The book explores: the history of high-functioning autism; diagnosis of the disorder; assessment; and treatment for the individual and their families. The text is written in a style that is accessible to both seasoned clinicians and concerned lay persons.