Define and explain pervasive developmental disorders.

The diagnostic category pervasive developmental disorders (PDD), as opposed to specific developmental disorders (SDD), is a group of disorders characterized by delays in the development of multiple basic functions including socialization and communication. The pervasive developmental disorders were autism, Asperger syndrome, pervasive developmental disorder not otherwise specified (PDD-NOS, i.e. all autism spectrum disorders (ASD)), childhood disintegrative disorder (CDD), overactive disorder associated with mental retardation and stereotyped movements and Rett syndrome. The first four of these disorders are commonly called the autism spectrum disorders; the last disorder is much rarer, and is sometimes placed in the autism spectrum and sometimes not.

The terminology PDD and ASD is often used interchangeably and varies depending on location. The two have overlapping definitions but are defined differently by the Diagnostic and Statistical Manual of Mental Disorders, 5th edition (DSM-5) and the International Classification of Diseases, 10th edition (ICD-10). DSM-5, removed PDD as a diagnosis and replaced it with ASD and the relative severity of _______ ______ _______ _____ ___ _______ __________ _________ ________ _____.
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