Attention Deficit Hyperactivity Disorder (ADHD) is one of the most common disorders treated in Child and Adolescent Mental Health Services in many countries, but there is huge variation in prevalence. This symposium will include four (4) presentations which will critically review difficulties in estimating prevalence rates, including the possibility of undiagnosed ADHD in adulthood. In addition, the treatment issues such parental attitudes on deciding to commence medication & a review of treatment outcomes where availability of medication is limited.