Behavior analysis is the science of behavior, with a history extending back to the early 20th century. Its underlying philosophy is behaviorism, which is based upon the premise that attempting to improve the human condition through behavior change (e.g., education, behavioral health treatment) will be most effective if behavior itself is the primary focus. To date, behavior-analytic scientists have conducted thousands of studies to identify the laws of behavior — the predictable ways in which behavior is learned and how it changes over time. The underlying theme of much of this work has been that behavior is a product of its circumstances, particularly the events that immediately follow the behavior. Behavior analysts have been using this information to develop numerous techniques and treatment approaches for analyzing and changing behavior, and ultimately, to improve lives. Because this approach (applied behavior analysis) is largely based on behavior and its consequences, the techniques generally involve teaching individuals more effective ways of behaving and making changes to social consequences of existing behavior.