This document discusses pervasive developmental disorder (PDD), which refers to a group of conditions characterized by impairments in social interaction and communication skills. PDD includes autism, Asperger's syndrome, and pervasive developmental disorder not otherwise specified. Symptoms involve difficulties with verbal and nonverbal communication, social interaction, and engaging in repetitive behaviors. Treatment involves special education, behavior modification, occupational and speech therapy, and medication to treat specific symptoms. The document also briefly outlines a homeopathic approach to treatment.