Measurement system analysis (MSA) or gage repeatability and reproducibility (Gage RR). It is a tool that is used to validate the measurement system to see if the measurement system is able to give the data that can be relied upon.

If measurement system is not validated, the data coming out of the measurement system would be questionable.

The main purpose of MSA is to verify if the measurement system is able to provide:

• Representative values of characteristic being measured;
• Unbiased results; and
• Minimal variability.

Accuracy and Precision

% GRR CALCULATION

EV            Equipment variation

AV            Appraiser variation

PV            Part variation

TV            Total variation

GRR Gase Repeatability and reproducibility

Ndc   Number of distinct categories

Ndc ≥ 5