How to define and identify lessons learned?

Dear EvalForward colleagues, As M&E professionals, we are often requested to identify and consolidate “lessons learned”. From my experience, there is not a shared understanding/ definition of what a lesson learned is. Often I come across lessons that sound like findings, conclusions, or sometimes even like recommendations and therefore belong somewhere else. I would be interested to learn from this community: which is the definition of lesson learned that you adopt or one you find useful?

Lessons learned

Lessons Learned in Project Management: Definition, Example, and Template

How to define and identify lessons learned?

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Lessons Learned - What Is Lessons Learned? Definition, Types, Uses

Lessons Learned - What Is Lessons Learned? Definition, Types, Uses

How to define and identify lessons learned?

Solved 3) When applied to project management, human resource

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Lessons Learned in Project Management – Example and Templates

Lessons Learned - What Is Lessons Learned? Definition, Types, Uses