We assessed three types of class structure and four academic content types. With respect to class structure, on average, the children with ADHD and the matched controls as a whole spent 59% (SD = 26%) of their time on whole group work, 6% (SD = 15%) of their time on small group work, and 35% (SD = 27%) of their time on individual work. With respect to academic content type, children spent 42% (SD = 29%) of their time on highly academic tasks, 19% (SD = 30%) of their time on less academic tasks, 25% (SD = 23%) of their time on nonacademic tasks, and 14% (SD = 9%) of their time on instructional transitions between lessons.