2+-+Classifications

The below wiki offers a great deal of information regarding the definition of PDD's / ASD's:
htttp://autism.wikia.com/wiki/Pervasive_Developmental_Disorder

Types of Pervasive Developmental Disorder
[|Autism] (a developmental brain disorder characterized by impaired social interaction and communication skills and by a limited range of activities and interests) is the most characteristic and best-studied pervasive developmental disorder.

Other types of pervasive developmental disorder include:


 * [|Asperger syndrome]
 * [|Childhood disintegrative disorder]
 * [|Rett syndrome]
 * [|Pervasive developmental disorder -- not otherwise specified (PDD-NOS, including atypical autism)]