MEASUREMENT SYSTEM ANALYSIS

Measurement System Analysis (MSA) or Gage R&R (Gage Repeatability and Reproducibility) is a method to control and judge a measurement process. It is useful to determine which sources are responsible for the variation of the measurement data. The word "gage" (or gauge) refers to the fact that the methodology is aimed at validating instruments or measurement methods.
In contrast to the Gage R&R for quantitative measurements, the analysis based on attributes gives information on the "agreement" and on the "correctness". The concepts of variance, repeatability and reproducibility are not relevant in this case.