Attention deficit hyperactivity disorder is a lifelong neurodevelopmental disorder that affects the brain and results in a variety of inappropriate and maladaptive behaviors. ADHD is not a disease (Kajander 1995) but is a processing deficit that results in children having difficulty with inhibitory control. That is, children with ADHD lack self-control, something they cannot help. In children with ADHD, the parts of the brain that control attention and stop inappropriate behavior are underdeveloped (Barkley 1996; Kajander 1995). ADHD occurs three times more frequently in male students than female students (Reeve et al. 1995) and commonly occurs with other disorders. For example, ADHD occurs in 20 percent to 50 percent of the students with learning disabilities, in 65 percent of the students with oppositional defiant disorder, and in 20 percent to 30 percent of the students with conduct disorder (Reeve et al. 1995; Barkley 1990).