Inclusion Criteria for autism participants:

   - Children between the ages of 1.6 and 17.11 years of age

   - Males and females

   - Diagnosis of autism based on DSM-IV-TR criteria, an expert clinical evaluation, and
   ADOS or ADI-R if needed

   - Receiving or will receive a parent delivered intervention to alleviate symptoms
   related to their diagnosis of autistic disorder

   - Have a care provider that will reliably bring subjects to their chosen intervention
   and clinic visits, and is trustworthy to provide accurate accounts of services
   provided to the subject

Inclusion Criteria for developmentally delayed participants:

   - Will have an age range between 1.6 and 17.11 years of age

   - Males or females

   - Diagnosis of a developmental delay or disorder based on DSM-IV-TR, ICD-10, and an
   expert clinical evaluation

   - Have historical evidence of significant abnormal developmental milestones as
   determined by neurological history

   - Receiving or will receive a parent delivered intervention

   - Have a care provider that will reliably bring subjects to their chosen intervention
   and clinic visits, and is trustworthy to provide accurate accounts of services
   provided to the subject

Exclusion Criteria for autism participants:

   - Is medically unstable (e.g., more than one seizure a month)

   - Have a medical diagnosis that causes autism like symptomology (e.g., Fragile X, Down
   syndrome, Angelman's syndrome, tuberous sclerosis, Rett's disorder)

Exclusion Criteria for developmentally delayed subjects:

   - Is medically unstable (e.g., more than one seizure a month)

   - Has a diagnosis of ASD