Quality concepts
Lessons learned
Also called: lessons-learned log
Lessons learned are the deliberate capture of what a project taught — the details that caused trouble, the sequences that worked, the recurring defects and how they were finally solved — written down so the knowledge outlives the crew that earned it. On a well-run program it is a real record fed by nonconformances, corrective actions and the close-out review, not a memory that walks off the job at demobilization. It is the raw material continuous improvement runs on.
Why it matters
The same mistake made on the last job is expensive to make again on this one. Captured lessons are how a builder stops paying twice for the same education — the flashing detail, the coordination clash, the submittal that always comes back wrong.
They are most valuable when they change something concrete. A lesson that only lives in a closeout document changes nothing; one that rewrites a checklist item or a pre-installation checklist actually prevents the repeat.
How it shows up on site
A running log of what caused nonconformances and how they were resolved, reviewed at close-out and rolled into the next project's quality plan and checklists so the fix travels with the company, not just the job.
Checklists that put lessons learned to work
Free, field-ready checklists, each with the photo every item needs before it can be submitted.
Related terms
- Continuous improvementSteadily feeding what a job learns back into how the next work is planned, so the same defects stop recurring.
- Root cause analysisWorking back from a defect to the real reason it happened, so the fix stops it recurring instead of just cleaning it up once.
- Corrective actionThe step taken to fix a nonconformance and stop it happening again — both the repair and the change that prevents a repeat.
- Closeout packageThe compiled record proving the work was completed, inspected, and accepted, assembled to close out the contract.
- Quality assurance (QA)The planned system of procedures, plans and checkpoints set up before work starts so the right result is built the first time.
- Quality control (QC)The hands-on inspection and testing of installed work against the spec — checking the actual product, not the process that made it.
Knowing the term is step one. Proving it is the job.
RTI holds the submit button until every mandatory item is answered and the photos are attached, then chains the record so it can be proven untouched later.