Per PMBOK/PRINCE2, this register is a living log maintained throughout the program, not written from scratch at closure. Each entry separates what happened (factual, blame-free) from root cause (why it actually happened) from recommendation (a specific, actionable change) — the structure recommended across PMI and independent PM practice guides, rather than a single vague "lesson" field. Summarized in the Project Closeout Report §7.
8
Lessons Captured
6
Improvement Lessons
2
Positive Practices
8/8
Recommendations Implemented