All behavior happens for a reason. Our job is to figure out why the behavior is happening. The 4 functions of behavior are sensory, escape, attention, and tangible (SEAT). Behaviors can occur for one or multiple of those functions. You can also view the functions of behavior by identifying behaviors as either behaviors that function to get access to something (attention, specific activity, sensory input, etc.) or behaviors that function to get out of or away from something (attention, activity, task, demand, sensory overload, etc.).