Attention Deficit/Hyperactivity Disorder (ADHD) is characterized by a persistent pattern of inattention and/or hyperactivity that is present before 12 years of age. Inattention may interfere with social, academic, or occupational performance. In childhood, this often manifests in difficulty completing school-related tasks, messy schoolwork, careless errors, and difficulty following directions. Hyperactivity often involves excessive motor activity. Difficulty remaining seated, frequent running and climbing, and excessive talking are often noted. In addition to inattention and hyperactivity, impulsivity may also be present in the form of frequent intrusion of others’ conversations and difficulty delaying responses (e.g., blurting out answers in class). Ability to socialize and obtain/maintain friendships is often hindered as a result. Adults with ADHD frequently have difficulty organizing and completing tasks. High levels of distractibility and difficulty focusing and maintaining concentration are evident in both children and adults.