Pivotal Response Treatment for Individuals With Intellectual Disabilities

Inclusion Criteria for Individuals with Intellectual Disabilities:

   - Participants will have an age range between 2 and 17.11 years of age inclusive

   - Male or female

   - Diagnosis of an intellectual disability based on the fourth edition of the Diagnostic
   and Statistical Manual of Mental Disorders (DSM-IV-TR), the 10th revision of the
   International Statistical Classification of Diseases and Related Health Problems
   (ICD-10), and an expert clinical evaluation

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

   - care provider that will reliably bring subject to study visits, and is trustworthy to
   provide accurate accounts of services provided to the subject

Inclusion Criteria for Individuals with Speech Delay/Language Disorder:

   - Participants will have an age range between 2 and 17.11 years of age inclusive

   - Male or female

   - Diagnosis of a speech delay based on the fourth edition of the Diagnostic and
   Statistical Manual of Mental Disorders (DSM-IV-TR), the 10th revision of the
   International Statistical Classification of Diseases and Related Health Problems
   (ICD-10), and an expert clinical evaluation

   - Preschool Language scale (PLS) score of at least 1 standard deviations below age level
   (for children in the age range of 2-6.11)

   - care provider that will reliably bring subject to study visits, and is trustworthy to
   provide accurate accounts of services provided to the subject

Exclusion Criteria:

   - medically unstable (such as having unstable seizures)

   - primary diagnosis of Autism Spectrum Disorder (ASD) is exclusionary as determined by
   the investigators