ADHD is a chronic neurobiological condition that affects people of all ages, genders, and races. Symptoms of ADHD may include, but are not limited to, the following: poor attention span; physical restlessness or hyperactivity; excessive impulsivity; chronic procrastination; frequently losing things; poor organization, planning, and time management skills; and excessive forgetfulness. Not every person with ADHD exhibits all of these symptoms, and the severity of the disorder can range from mild to severe. While there is no cure for ADHD, the condition can be managed with an accurate diagnosis and proper treatment. Left untreated, individuals with ADHD may experience significant impairment in social, emotional, occupational, and academic functioning. Stimulant and non-stimulant medications are usually effective in alleviating symptoms of ADHD in adults. However, some research suggests that medications may not effectively treat self-management functioning problems and that as many as one-third of adults with ADHD have inadequate responses to medication treatment. Additional research on the benefits of psychosocial treatments for ADHD in adults is needed. This study will determine the effectiveness of group cognitive-behavioral therapy as compared to a problem-solving social support group in treating problems of time management, organization, and planning in adults with ADHD.