A study that evaluates measurement system repeatability and reproducibility across operators and equipment.
Gage R&R confirms whether inspection data is trustworthy before teams act on it.
It is a core method within broader measurement system analysis practices.
What Gage R&R measures
Repeatability checks variation when the same operator measures the same part repeatedly.
Reproducibility checks variation between operators using the same method and equipment.
Decision thresholds
State whether the percentage is measurement variation relative to study variation or tolerance. These use different denominators. Assess the result against the intended measurement task.
When results are poor, teams should revise the control plan and retrain operators.
Check fixtures, method, resolution and operator technique when the result is poor. Calibration alone does not establish acceptable Gage R&R.
Key takeaways
- Reliable measurement is a prerequisite for reliable quality decisions.
- Gage R&R separates process variation from measurement noise.