We assessed if autism symptoms relate to ability deficits and achievement discrepancies in 29 children aged 4-13 years with a diagnosis of Autistic Disorder. Symptoms, intelligence, language, motor coordination and social cognition were assessed. Children with autism underachieve on all ability measures. There were significant achievement discrepancies between Performance IQ and theory of mind, fine and gross motor coordination. The most common discrepancy was between Performance IQ scores and motor coordination scores, which was observed in 86% of children. Early developmental abnormalities related to most abilities, social interaction symptoms related to motor coordination and receptive language, and symptoms related to discrepancies between PIQ and social cognitive abilities.