- Asperger’s Disorder (AD) : Asperger’s Disorder or AD refers to a pervasive developmental disorder characterized by major difficulties in social interaction and unusual patterns of interest and behavior in children with relatively intact cognitive and communication skills. A child with Asperger’s Disorder maintains adequate cognitive and language development but becomes severely impaired in social interaction. Children with this disorder also develop restricted, repetitive, and stereotyped patterns of behavior, interests, and activities.