All behavior serves a purpose or function—typically to access or avoid something. Thus, it is important to figure out the function of a student’s behavior to develop a plan with likelihood for success. To help determine function, school teams should start by collecting data on the A, B, Cs of behavior: Antecedent (A): anything that happens immediately before the behavior occurs Behavior (B): the action a student demonstrates that can be clearly defined and measured Consequence (C): any event (positive or negative) that occurs after a student demonstrates a behavior Once the function is determined, strategies or interventions can be put into place.