Attention-deficit/hyperactivity disorder (ADHD) is a multifaceted and complex neurobehavioral condition that affects millions of individuals worldwide. Primary features of ADHD include behavioral inattention and/or hyperactivity-impulsivity [Page 110]that interfere with functioning and daily living. These symptoms, as well as related difficulties, can continue into adulthood and, in some individuals, may have a lasting impact on social and occupational outcomes and quality of life.

A thorough assessment of individuals with suspected ADHD can provide diagnostic clarity and assist with treatment planning. Because symptoms of the condition begin in childhood and are most prominent during this developmental period, this entry focuses on methods of assessment of ADHD in youth. Yet, it is important to know that some individuals seek evaluations of ADHD for the first time during late adolescence ...