1 ATTENTION DEFICIT HYPERACTIVITY DISORDER (ADHD): The Concept, Characteristics, Etiology, Assessment, Diagnosis and Classroom Management for Children with ADHD. By Abdulrahman Isah Abubakar Email: abdulacademia@gmail.com GSM: +2348144262701 Abstract Attention Deficit Hyperactivity Disorder (ADHD) is a common neuro-developmental disorder that has far-reaching implications for the psychological, social and academic functioning of affected individuals. The symptoms of ADHD generally are first seen in childhood but can continue into adulthood. Therefore, this paper discussed the concept of ADHD, characteristics of ADHD, eatiology of ADHD, assessment and diagnosis of ADHD as well as classroom Management for children with ADHD. Finally, the paper ended with conclusion and recommendations. Keywords: Assessment, Attention, Deficit, Diagnosis, Disorders, Hyperactivity. Introduction Attention Deficit Hyperactivity Disorder (ADHD) is a common neuro-development behavoural disorder among school – age children, which continues in adolescence and adulthood in most cases (Biederman and Faraone, 2005). It is mainly characterized by inattentiveness, over activity and impulsiveness. According to Barkley (2002) ADHD is predictable and persistent, with up to 80% of diagnosed children continuing to meet diagnostic criteria in adolescence while up to 67% were said to continue to have significant symptoms of the disorder throughout their life. Attention Deficit Hyperactivity Disorder (ADHD) is also one of the most frequently diagnosed behavior disorders among primary school pupils which manifest itself in early childhood. It is characterized by developmental inappropriate level of inattention, hyperactive or impulsive – motor activity that appears at least in two contexts i.e. home and school and it has