1. Autism Spectrum Disorder (As defined by a gold standard measure for ASD diagnosis: the Autism Diagnostic Observation Schedule, Autism Diagnostic Interview, and/or the minimum Arkansas state requirement for autism classification, as defined by a consensus diagnosis of ASD by a medical doctor, speech pathologist, and psychologist.). In an event where sufficient diagnostic information is lacking, and the PI believes that the clients meet all other inclusion criteria and a prospective diagnosis of an ASD is clinically warranted, and a formal diagnosis is scheduled to occur within a reasonable time frame from the date of study entry, then the client may be considered as potentially eligible.