The core deficits associated with ASD pose significant obstacles to achieving social competence; indeed, the deficits, in many cases, define social incompetence. The diagnostic criteria for autism include qualitative impairment in social interactions and verbal and non-verbal communication, including delay in the acquisition of expressive language (American Psychiatric Association (APA), 2000). A pattern of narrow, restricted interests and stereotyped behavior are also requirements of the diagnosis. The diagnostic criteria for Asperger's Disorder also include impaired social interaction and restricted interests without delay in language acquisition and with average to above average intelligence (APA, 2000). In sum, ASD is defined by significant impairment in social functioning that is qualitatively distinctive from both typical social functioning and from social functioning deficits associated with other diagnoses.

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