4. The diagnosis for ADHD will be made using an exam called the Diagnostic Interview Schedule for Children Version IV (DISC IV). This is a 90-minute exam that is done with a computer that helps you know what questions to ask and helps record the responses. The parents will also be asked to complete a few instruments and surveys that help us understand how well treatment is working. The investigators expect these exams to take about half an hour to complete. They contain questions about the subject's behavior and are completed by parents, except one brief instrument that the investigators will ask and teachers to complete before each follow-up visit. These instruments take about 10 minutes each to complete.