The Project Management Professional (PMP) guidelines emphasize the importance of capturing lessons learned as an ongoing effort throughout the life of the project. This process involves engaging key stakeholders to document both positive and negative experiences, which can then be used to improve future projects. It is essential for the project manager to lead this effort to ensure that valuable insights are not lost and that the organization can benefit from past experiences1.
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PMI's "Lessons Learned Next Level Communicating" article1.
PMI's "Lessons (Really) Learned? How To Retain Project Knowledge And Avoid Recurring Nightmares" article2.
PMI's "Learning how to learn - Project Management Institute" article3.