Hi. I'm Benjamin Yerys, a child psychologist at The Children's Hospital of Philadelphia. Children with autism have a secondary diagnosis of attention-deficit/hyperactivity disorder (ADHD) anywhere from 30% to 50% of the time. This is a very high rate. We wanted to evaluate whether this was accurate and whether the tools we use in children with autism are valid, being that they were created for use in children with ADHD in the general community.