CAPA vs NCR
CAPA vs NCR: What's the Difference and When to Use Each
By the QCIN team · · 3 min read
In short: An NCR deals with the bad product in front of you; a CAPA deals with why it happened and stops it happening again. Not every NCR needs a CAPA, but every CAPA should be traceable to evidence.
The short answer
A nonconformance report (NCR) records that something did not meet requirements and controls what happens to it. A corrective and preventive action (CAPA) investigates the cause and changes the process so the problem does not recur. The NCR is about the product; the CAPA is about the system.
Side-by-side comparison
| NCR | CAPA | |
|---|---|---|
| Purpose | Identify and control nonconforming product or material | Eliminate the root cause of a problem |
| Trigger | Failed inspection, customer return, supplier defect, audit observation | Repeat or significant NCRs, complaints, audit findings, trend signals |
| Key decisions | Containment and disposition: use as is, rework, repair, scrap, return to supplier | Root cause, actions, owners, due dates, effectiveness criteria |
| Typical duration | Hours to days | Weeks to months |
| Closure evidence | Disposition completed and recorded | Data showing the problem has not recurred |
| ISO 9001 reference | Clause 8.7 Control of nonconforming outputs | Clause 10.2 Nonconformity and corrective action |
When an NCR should become a CAPA
Raising a full CAPA for every scratch overwhelms the team and makes CAPA a paperwork exercise. Raising one for nothing means problems repeat. A simple, written escalation rule removes the guesswork. A typical rule set looks like this:
- Any defect that reached a customer.
- Any safety, regulatory or critical characteristic failure.
- The same defect on the same part appearing a set number of times within a period, for example three times in 30 days.
- A cost of poor quality above a threshold you define.
- Any major audit finding.
How they connect in practice (illustrative example)
An inspector finds burrs on a machined bracket. An NCR is raised, 40 parts are quarantined and the material review board decides to rework them by deburring. That closes the NCR. The next week the same burr appears again on a different lot. The escalation rule triggers a CAPA. The team uses a 5-Why analysis and finds that the deburring tool change interval was based on time rather than part count, and production volume had doubled. The corrective action changes the interval to a part count and adds a check to the setup sheet. Effectiveness is verified by monitoring the next 10 lots for zero burr NCRs.
Both records exist, they link to each other, and an auditor can follow the story from the first defect to the verified fix.
Correction, corrective action and preventive action
- Correction: fixing the immediate problem, such as reworking the 40 brackets.
- Corrective action: removing the cause of a problem that has happened, such as changing the tool change interval.
- Preventive action: removing the cause of a potential problem before it happens, such as applying the same rule to similar machines. ISO 9001:2015 handles this mainly through risk-based thinking rather than a separate procedure.
Common mistakes
- Writing 'operator error' or 'retrain operator' as the root cause. Ask why the process allowed the error.
- Closing a CAPA as soon as actions are done, before checking effectiveness.
- Keeping NCRs and CAPAs in separate spreadsheets with no link between them.
- No owner or due date on actions.
Defining effectiveness before you act
The weakest part of most CAPA systems is verification. Teams complete the actions, tick the box and close the record, then the same defect returns six months later. The fix is to write the effectiveness criterion when the CAPA is opened, before anyone has a stake in a particular answer. A good criterion names the measure, the threshold and the observation window, for example: zero NCRs for burrs on part family B across the next 10 production lots, or first pass yield on line 2 at or above its previous 12-week average for 8 consecutive weeks.
Choose a window long enough to include the conditions under which the problem originally occurred, such as a full tool life, a different material lot or a night shift. If the criterion is not met, reopen the investigation rather than adding more actions to the same unproven root cause.
Managing both in one place
QCIN links NCRs and CAPA in a single workflow: NCRs carry containment, disposition and lot holds, and can escalate to CAPA with 5-Why, fishbone and an effectiveness check that must be completed before closure.