Lessons Learned
Knowledge gained during the project, recorded so future projects can benefit.
Lessons learned are documented knowledge — positive and negative — captured continuously as a project progresses, not just at close. They are recorded in the lessons learned register, a live project-level artifact updated throughout execution, then transferred at close into the organizational lessons learned repository, an organizational process asset (OPA) future teams reuse. The exam trap is confusing the two: the register is the working in-project log; the repository is the permanent organizational store. On predictive projects the register is built during execution and finalized at closing; on agile or hybrid projects, retrospectives capture the same learning iteratively and feed the same repository.
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