Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The diagnostic category pervasive developmental disorders (PDD), as opposed to specific developmental disorders (SDD), refers to a group of five disorders characterized by delays in the development of multiple basic functions including socialization and communication. The pervasive developmental disorders are: Pervasive developmental disorder not otherwise specified (PDD-NOS), which includes atypical autism, and is the most common; Autism, the best-known; Asperger syndrome; Rett syndrome; and Childhood disintegrative disorder (CDD).
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