The purpose of ICARD research is to learn about the best treatment approaches for children who have both Attention Deficit Hyperactivity Disorder (ADHD) and serious reading difficulties (RD). ADHD and RD are common childhood disorders and frequently co-occur. A number of studies suggest that students who have both disorders have even more severe academic and social difficulties and higher school dropout rates than students who have only RD or only ADHD. Nevertheless, there has very little research on interventions for students with both conditions. Educators, physicians, clinicians, and parents need to know (a) whether it is sufficient to provide these students with supplemental reading interventions without directly treating the ADHD; (b) whether students’ reading outcomes will improve with ADHD treatments alone, without supplemental reading intervention; or (c) whether students need treatments for both ADHD and RD. This study is comparing student outcomes when students receive treatment for ADHD only, RD only, or the combination of the two.