- have an intellectual disability as reported by guardian. If IQ is questionable or has not been assessed, the Block Design and Vocabulary subtests of the Wechsler Intelligence Scale for Children (WISC-IV) will be administered. If the youth receives an IQ subtest score < 6 on either one of these two subtests of the WISC-IV, a full scale IQ score (FSIQ) will be obtained. Children with FSIQ < 80 will be excluded