 - Potential participants will be evaluated individually and included in the study if they achieve a Full Scale IQ score70, a verbal mental age6 years old, and meets DSM-IV-TR criteria for either a Pervasive Developmental Disorder or ADHD. IQ and verbal mental age will be measured with the Wechsler Abbreviated Scale of Intelligence WASI Verbal, Performance and Full Scale IQ scores represented as Standard Scores: mean100; SD15. 