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Project Management & Agile · Advanced

Measurement System Analysis (MSA)

Evaluation of a measurement system's accuracy, precision, and stability before relying on its data.

Definition

Gage repeatability and reproducibility (Gage R&R) studies quantify variation from equipment (repeatability) and appraisers (reproducibility). A Gage R&R under 10% of total variation is generally acceptable; 10-30% may be acceptable depending on application.

Example

Three operators measure ten parts three times each to assess the gauge.

Exam tip

Do MSA in the Measure phase before collecting baseline data.

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