At the end of a project, or of each stage, the team captures what went well and what didn't, and turns it into changes to templates, standards and requirements. Close-out also means archiving the record properly, so the next project starts better.
The best way to make the next project easier is to learn from this one, deliberately. Lessons learned sessions capture what went well and what didn't; close-out makes sure the project's record is complete and archived. Both are often skipped when everyone rushes to the next job.
A lesson is only useful when it changes something:
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