This document provides an overview of behavior analysis as a natural science approach to understanding behavior. It describes how behavior analysis has evolved from early psychology to become a data-driven science focused on observable behavioral processes rather than hypothetical constructs. Key aspects of radical behaviorism are discussed, including its empiricism, determinism, and analysis of behavioral functions like reinforcement, motivating operations, and discriminative stimuli. The document emphasizes that behavior analysis strategies involve assessing environmental influences on behavior through functional behavior assessments and designing interventions to strengthen desirable behaviors based on reinforcement.