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Lessons Learned Repository

An organized archive that captures, organizes, and provides access to lessons learned and related historical knowledge from past projects.

Key Points

  • An organizational process asset used to inform planning, execution, monitoring, and closing.
  • Entries should include context, issue or success, root cause, actions taken, outcomes, and searchable tags.
  • Updated continuously through retrospectives and after-action reviews, not only at project close.
  • Typically governed by the PMO or knowledge management team with standards for quality and access.

Example

A project manager planning a data migration reviews the lessons learned repository and finds that a prior project experienced data loss during a single-weekend cutover. The record recommends a phased migration with parallel runs. The team adopts the phased approach and avoids the previously encountered issues.

PMP Example Question

During project planning, a manager wants to avoid repeating mistakes made in similar past projects. What should the manager consult first?

  1. Issue log
  2. Lessons learned repository
  3. Risk register
  4. Project management plan

Correct Answer: B — Lessons learned repository

Explanation: The lessons learned repository contains historical insights from previous projects that can guide current planning decisions. The other documents do not serve this purpose.

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