65:“A lesson learned is knowledge or understanding gained by experience. The experience may be positive, as in a successful test or mission, or negative, as in a mishap or failure...A lesson must be significant in that it has a real or assumed impact on operations; valid in that is factually and technically correct; and applicable in that it identifies a specific design, process, or decision that reduces or eliminates the potential for failures and mishaps, or reinforces a positive result.”
81:“Generalizations based on evaluation experiences with projects, programs, or policies that abstract from the specific circumstances to broader situations. Frequently, lessons highlight strengths or weaknesses in preparation, design, and implementation that affect performance, outcome, and impact.”
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In the military field, conducting a
Lessons learned analysis requires a leader-led after-actions debriefing. These debriefings require the leader to extend the lessons-learned orientation of the standard
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Department of the Army (2009). Field Manual No. 6-22.5. Combat and
Operational Stress Control Manual for Leaders and Soldiers. Department of the Army Headquarters, Washington, DC, 18 March 2009. p. 50
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104:(CALL) since 1985 covers in detail the Army Lessons Learned Program and identifies, collects, analyzes, disseminates, and archives lessons and best practices.
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This article is about the concept in project management. For other uses, see
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There are several definitions of the concept. The one used by the
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306:"PBC Working Group on Lessons Learned: Report | PEACEBUILDING"
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Organisation for
Economic Co-operation and Development
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16:Experiences distilled from past activities
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226:(1st ed.). Auerbach Publications.
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77:(OECD) defines lessons learned as:
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254:NASA Lessons Learned
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132:Debriefing
57:(ESA) and
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