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The DSM-IV describes a group of conditions called Pervasive Developmental Disorders (PDD) as "severe and pervasive impairments" in the areas of communication, social skills and behaviour. The specific diagnoses listed as Pervasive Developmental Disorders in the DSM-IV are:
- Autistic Disorder
- Rett's Disorder
- Childhood Disintegrative Disorder
- Asperger's Disorder
- Pervasive Developmental Disorder, not otherwise specified (PDD-NOS)