Gage Repeatability

Factors that affect measurement system variation can be studied using the gage repeatability and reproducibility (GR&R) technique.

Measurement system variation can be characterized by location (stability, bias, linearity) and width or spread (repeatability and reproducibility).

Gage repeatability and reproducibility (GR&R) study can be applied in most manufacturing-related measurement systems. It may be used as:

  • A criterion for judging new measuring equipment.
  • A comparison among measuring devices.
  • A means for improving performance of measuring instruments.
  • A comparison for measuring equipment before and after repair.
  • A required component for calculating process variation and the acceptability level for a production process.
  • A measure of the need for training in how to use measuring instruments.

Excerpted from The Certified Quality Technician Handbook, page 123.

Tutorial: Estimating Total Measurement Variation

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Using Data