Objective: This study examines the relationship between parents' knowledge ofattention-deficit hyperactivity disorder (ADHD) combination with one another. For example, Wolraich and colleagues found that 80% of children with ADHD were treated with stimulant medication (3). As well, systematic nonpharmacological interventions (for example, parenttraining courses, family therapy, behavioural-management training) were found to be recommended with less frequency than was medication.Long-term outcome for children with ADHD appears to be correlated with the length ofadherence to treatment (4); however, many families do not enrol in recommended treatments or do not adhere to the treatment for the entire duration. In a study that examined adherence in families with a child with ADHD receiving methylphenidate (MPH) alone, MPH with a behavioural program, or placebo with a behavioural program, 20% of children had discontinued medication by 4 months, 45% had discontinued by 10 months, and 51% ofthe families did not follow the behavioural intervention program to completion (5).Lack of adherence to treatments for ADHD is not explained by factors such as socioeconomic status, parenting stress, or