Attention Deficit Hyperactivity Disorder (also called ADHD) is a common problem of emotional and behavioral difficulties. According to the HADD Ireland website (2014), Attention Deficit Hyperactivity Disorder is a medical/neurobiological condition in which the brain's chemical neurotransmitters, norepinephrine and dopamine, do not function properly. ADHD is a disorder that, without proper detection, treatment and management, can have significant and lasting effects and consequences for an individual. It is a long-term genetic disease that causes various learning and behavioral problems. ADHD is generally described as being made up of 3 main behaviors: Primarily hyperactive; impulsive and poorly monitored behavior, symptoms include: fidgeting and squirming in one's seat, often talking excessively and extremely agitated. Mainly inattentive; problems with attention, distraction, short-term memory and learning. Symptoms include: easily distracted and slow to complete different tasks. Children with this type of behavior are less likely to act out or have difficulty getting along with other children. They often sit quietly, but they may not pay attention to what they are doing. Therefore, parents and teachers may not notice that the child has ADHD. Combined hyperactive-impulsive and inattentive. Symptoms of impulsivity include: Difficulty learning the consequences of their behavior. Short fuses and often prone to accidents. This type is a combination of hyperactive and inattentive. Most children with ADHD fall into this category of behaviors (National Institute of Mental Health website, 2014). ADHD can cause a variety of problems in children, including: forget it...... middle of document...... Mental and behavioral disorders (World Health Organization, 1992 cited in Dermot O'Reilly, 2005 ). These two systems developed on their own until recently, when an increase in the level of interaction between them resulted in the convergence of their definitions. The Dimensions of Dysfunction Approach: The Dimensions of Dysfunction approach to classifying children's conduct problems identifies the extent to which a child's behavior differs from that of a normative comparison group. This approach is characterized by the use of behavioral checklists. As O'Reilly (2005) states, a diagnosis of conduct disorder requires the presence of a repetitive and persistent pattern of behavior that involves the violation of the rights of others. or social rules, as well as impaired social, academic or professional functioning.