Using gage repeatability and reproducibility studies help determine when parts are in or out of spec.
Gage Repeatability and Reproducibility (GR&R) studies provide information on measurement system performance by using ratios of measurement variation and part tolerance gathered from multiple part and operator measurements. If measurement variation can be reduced and GR&R ratios improved, it is easier to differentiate between parts that are in or out of specification, allowing parts to be accepted or rejected with greater confidence.