This document provides information on autism spectrum disorder (ASD), including its characteristics, diagnosis, and interventions. It defines ASD according to the DSM-IV and notes three key deficits in ASD - communication, social skills, and imagination. It lists common signs and symptoms of ASD in social interaction and behavior. The document also discusses diagnostic tools, biomedical and occupational therapy interventions, individualized education plans, applied behavior analysis therapy, and other treatments for ASD.