We evaluated a process of descriptive assessment, functional assessment, and assessment-based intervention with an elementary-school child who was described as having emotional and behavioral challenges, but who also exhibited above-average intelligence and communication skills. During a hypothesis-development phase, information was gathered from several sources induding an interview that was conducted directly with the participant. Descriptive information collected during this phase produced five hypotheses about variables maintaining the problem behavior that were then tested experimentally in the dassroom environment. The resulting functional assessment data supported the hypotheses. Intervention packages based on the hypotheses were implemented sequentially across English, spelling, and math dasses. The interventions were successful in increasing on-task behavior, and the improvements were maintained for the remainder of the school year.DESCRIPTORS: dassroom behavior, curriculum design, emotional and behavior disorders, functional analysis Educators and other school personnel are sometimes challenged by students who exhibit behavioral difficulties that are incompatible with the ongoing activities and structure of a school setting. Often, these behaviors are resistant to conventional methods of classroom management. When traditional strategies prove to be ineffective, it is common for schools to either apply more severe disciplinary procedures or place students in increasingly restrictive school programs