Abstract: Autism is a group of developmental disorders known as Pervasive Developmental Disorders (PDD). Pervasive developmental disorder is defined by the presence of abnormal and impaired development characterized as abnormal functioning in all three areas of social interaction, communication, restricted and repetitive behaviour, that manifests before the age of 3years. Autistic disorder is believed to occur at the rate of about 8 cases per 10000 children, with 4:1 ratio of males to females. An intensive early intervention is critical in maximizing outcomes for children with autism spectrum disorder (ASD), and evidence suggests that the earlier the intervention, the better the outcome.