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An After Action Review (AAR) is a structured review or de-brief (debriefing) process for analyzing what happened, why it happened, and how it can be done better by the participants and those responsible for the project or event. After-action reviews in the formal sense were originally developed by the U.S. Army. Formal AARs are used by all US military services and by many other non-US organizations. Their use has extended to business as a knowledge management tool and a way to build a culture of Accountability

Source: https://en.wikipedia.org/wiki/After-action_review