Attention Deficit/Hyperactivity Disorder (ADHD) is a disorder that is diagnosed based on behavioral presentation. Inattention, hyperactivity and impulsivity may have a variety of underlying causes that are neurodevelopmental. People with ADHD struggle to pay attention and to inhibit their impulses. They may struggle with emotion regulation and hyperactivity. ADHD has the following three sub-types: 1) inattentive type, 2) hyperactive/impulsive type, and 3) combined type. Individuals with ADHD might have challenges with schoolwork, with homework, or with interacting with others. It is considered the most common disorder of childhood. Behavior problems associated with the disorder present significant challenges to schools and parents. For example, not handing homework in, having incomplete work, and missing directions are common teacher and parents complaints of children with ADHD. These challenges continue into adulthood, with many adults with ADHD experiencing challenges with attention at work.