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Project Management

Lessons Learned

In Plain English

A structured review at project end to document what worked, what didn't, and how to improve next time.

Definition

Lessons learned is a project closeout activity in which the project team formally documents what went well, what went wrong, and what would be done differently on the next similar project. This institutional knowledge captures insights on scheduling, estimating, subcontractor performance, design coordination, and owner requirements. Companies that systematically capture and share lessons learned continuously improve project performance.

Example

The lessons learned meeting revealed that earlier subcontractor involvement in the MEP coordination model would have prevented three weeks of delays.

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