Comparison of DSM-IV-TR and DSM-5 for ASD

The study aim is to prospectively compare DSM-IV-TR and DSM-5 criteria for Autism Spectrum Disorder (ASD) in a sample of 250 children and adolescents who meet DSM-IV-TR criteria for ASD and 150 children and adolescents referred for diagnosis who do not meet DSM-IV-TR criteria.Families and children will be recruited from eight sites affiliated with the Autism Treatment Network (ATN). Participants must be between the ages of 2.0 and 17.11 years who undergo an ATN assessment at one of the eight sites. Both subjects who are found to meet criteria of ASD/PDD and those who do not meet criteria (after completing the ATN assessment) will be enrolled. After completing the standard ATN assessment, clinicians will complete a DSM-IV and DSM-5 checklist for ASD/PDD.