Manipulating the ratio of known to unknown items has been shown to improve student on-task behavior and increase the desirability of schoolwork. Although many intervention protocols manipulate ratios of known to unknown items, these frequently require extensive adult cuing. School psychologists recommending such interventions may face resistance…

The present study examined performance on an arithmetic task of increasing difficulty and a frustrating puzzle task for children with ADHD and comparison children. Emotional competence also was investigated in the two groups. Sixty-four children, 21 previously diagnosed with ADHD, participated. Performance on the arithmetic task was measured in…