Measurement system analysis (IATF only)
Plain-language summary
Knowing your gauge is calibrated is not enough — MSA asks whether the whole measurement SYSTEM (gauge + operator + method + environment) can actually distinguish good from bad on each control-plan measurement.
What the clause is really asking
Statistical studies (GR&R, bias, linearity, stability, attribute agreement) are required to analyse variation in the results of each measurement system named in the control plan. Methods and acceptance criteria should follow customer-referenced manuals (typically AIAG MSA) unless the customer approves alternatives.
What auditors look for
Auditors take the control plan and ask for the MSA study behind each measurement: current GR&R for variable gauges, attribute agreement for visual/go-no-go checks, study repeated after gauge change or repair. Results exceeding criteria with no action is a standard finding.
Typical evidence
GR&R studies; attribute agreement analyses; MSA planning linked to control plan; reaction records when studies fail criteria.
How to comply — recommendations
Plan MSA off the control plan: every measurement listed gets a study type and frequency. Re-study after repair, relocation or method change. When GR&R fails, fix the method or gauge — do not quietly widen the tolerance.
Common nonconformities
Control-plan measurements with no MSA; GR&R >30% accepted without action; visual inspections never given attribute studies; MSA not repeated after gauge replacement.
Related clauses
Builds on ISO 9001 7.1.5 (see Example row)
In the book
Chapter 7 — Support — People, Kit and the Truth About Documents treats this clause family in full: what it is really asking, what auditors look for, the evidence that satisfies, how to make it work on a real floor, and where companies stumble. This IATF requirement is covered in the Automotive Edition, in the same six blocks as the ISO clause around it.
Get the free ISO 9001:2026 Readiness Scorecard
Free, instant download. We'll only email you the occasional practical quality update — no spam, unsubscribe anytime.
Qlause provides interpretive guidance only and is not a substitute for the standard. Refer to your licensed copy of the relevant standard for the authoritative text.