We anticipate that this study will provide the primitive data on the symptomatology, neuropsychological functions, quality of life, and social/family function of adult patients with ADHD, will evaluate the treatment response of medication or psychosocial intervention in the aspects of symptomatology, neuropsychological functions, quality of life, and family function; and young psychiatric researchers will learn to conduct standardized psychiatric interview and neuropsychological tests, and to collect data, conduct statistical analysis, and prepare the manuscript. Our findings should have clinical implication in assessing and treating adult patients with ADHD and provide the preliminary data for future brain imaging, neurocognitive, and interventional studies on adult ADHD.