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Pervasive Developmental Disorders Pervasive Developmental Disorders Pervasive Developmental Disorders The Pervasive Developmental Disorders are characterized by varying degrees of impairment in communication skills, social interactions, and by restricted, repetitive and stereotyped patterns of behavior. According to the definition set forth in the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) (1994), “Pervasive Developmental Disorders are.