This document discusses behavioral assessment in clinical psychology. It begins with a brief history of behaviorism and then discusses how behavioral assessment differs from traditional assessment by focusing on samples of observable behavior rather than internal processes. Two key models for behavioral assessment are described: the SORC model and the ABC model, which analyze antecedents, behaviors, and consequences. Behavioral assessment uses methods like interviews, observation, self-monitoring, and checklists and is an ongoing part of the treatment process rather than a one-time event. Challenges to the reliability and validity of behavioral assessment are also noted.