Children and adolescents which are being considered for methylphenidate treatment and therefore referred to computerized cognitive tasks with and without methylphenidate IR use as part of their management. The recruitment will be from patients referred to the attention clinic at Edmond and Lilly Safra children's Hospital and diagnosed with ADHD. Patients treated with methylphenidate or under consideration for treatment with methylphenidate will be offered to join the study and will be included in the study after the proper consent forms will be signed by them and their parents. Clinical assessment including semi constructed interview by a psychiatrist as part of the regular management will be made.