The final meeting after the project delivery to summarize the lessons learned is good but has potential not to catch all lessons during the whole project.
Some of important Lessons learned especially at the beginning of the project may disappear.
1. Don’t save all lessons learned for the end of the project. Attach quick review meetings to project stage/milestones to support continuous learning. 2. Focus on WHY and HOW. What problems did the project encounter and How were those challenges solved? 3. Define it as What worked well? and What can we do better? 4. Make takeaways actionable and widely applicable, i.e. once the lessons learned have been collected repackage them for general use and apply them to your future work. 5. Make your conclusions accessible. Share the experience and the ideas with the wider team to improve as a team.