“Pervasive Developmental Disorders” is a relatively recent term that describes a class of disorders characterized by impairments in social interaction, imaginative activity, verbal and nonverbal communication skills, and a limited number of interests and activities that tend to be repetitive. These disorders include autism, Rett’s syndrome, childhood disintegrative disorder, Asperger’s syndrome, and “pervasive developmental disorder not otherwise specified” (PDDNOS). The following web sites are particularly useful for general information about PDD and PDDNOS. For information about specific disorders, visitors should check the related subjects.
This “package” from the Autism Society of America (ASA) includes the diagnostic criteria for PDD, a discussion of the difference between autism and PDD, and an opinion piece on the relationship between autism and PDD, as well as links to related ASA materials.
This extensive “briefing paper” from the National Information Center for Children and Youth with Disabilities (NICHCY) discusses definitions, causes, symptoms and signs, diagnosis, special education, treatment, parent support groups, and additional sources of information.