This stands for Attention-Deficit/Hyperactivity Disorder and was formerly called ADD. There are three types of ADHD — inattentive type, hyperactive-impulsive type, and combined type. The inattentive type is characterized by careless mistakes, difficulty paying attention, not following through on instructions, poor organization, easily distracted, and being forgetful. The hyperactive-impulsive type is characterized by fidgeting, leaving seat at inappropriate times, excessive talking, and interrupting others. Research shows that it is often a combination of therapy and medication that best treats symptoms of ADHD. Therapy often focuses on behavioral interventions and home and school such as behavior charts. Providing consistency and structure is a key component.