Objective: The aim of the study was to assess the functioning of patients with ADHD 6 to 7 years after the diagnosis. One objective was to determine the stability of diagnosis, symptoms decline, subtype change, remission, and change of diagnosis. Method: In all, 101 participants were chosen for testing. All were interviewed for the presence of ADHD and social, academic, and peer functioning, and completed Youth Self-Report. The caregivers completed a Wender Utah Rating Scale and Child Behavior Checklist, and were asked to assess the social, academic, and peer functioning of their offspring. Results: A total of 56% (n = 57) still met the criteria for ADHD and 24.7% (n = 25) still met the criteria for hyperkinetic disorder (HKD). Subtype migration was observed. In all, 7.7% (n = 14) were rediagnosed with Asperger’s syndrome, 2.2% (n = 4) received a diagnosis of bipolar disorder, 2.2% (n = 4) were diagnosed with mental retardation, 1 with schizophrenia, and 1 with genetic disorder. Conclusion: The reliability of diagnosis was high. The rates of all subtypes of ADHD decreased. More measures need to be taken in terms of differential diagnosis of ADHD and Asperger’s Syndrome. (J. of Att. Dis. 2012; XX(X) 1-XX)