This document discusses externalizing disorders among children and adolescents, focusing on attention-deficit/hyperactivity disorder (ADHD) and conduct disorder. It provides background information on the prevalence of mental health problems among children and adolescents in sub-Saharan Africa. It then describes the characteristics and diagnostic criteria for ADHD and conduct disorder according to the DSM-5. The document discusses etiology, negative outcomes associated with ADHD, and treatment approaches including medication and behavioral therapies. Assessment instruments for evaluating ADHD are also outlined.