Acceptance Criteria for Measurement Systems Analysis (MSA)

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Thanks so much for reading our publication. We hope you find it informative and useful. Happy charting and may the data always support your position.


Dr. Bill McNeese
BPI Consulting, LLC

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Measurement Systems Analysis/Gage R&R

Comments (11)

  • GeraintMay 1, 2018 Reply

    Bill, In terms of reporting percentages within Classic MSA, for AIAG you have the percentage of Tolerance consumed and the percentage of Total Variation. Your article is of course aimed at percentage of Total Variation consumed..I am not sure of the current status of the blue book from AIAG but worryingly some software computes this ratio incorrectly and some correctly depending on the options that are chosen. Whether they are computed correctly is one aspect, the other is what use are they when they have been computed even if correct.There are of course issues with the p/t ratio in general on many fronts. The ICC is the best and most appropriate way to assess the usefullness of a measurement process for a given application.The EMP option within the software has all the features to enable one to study and monitor any measurement process that outputs variable values.  

  • AnonymousOctober 7, 2020 Reply

    what method in msa  is the best way to use when monitoring the test equipment in a laboratory?

    • billOctober 7, 2020 Reply

      You use an individuals control chart (X-mR) to monitor a test method over time – measureing the same standard or control over time and plotting the results.  Objective is to keep the test method in control.

  • reviewunboxNovember 25, 2020 Reply

    Thanks for the step-by-step illustration. Even for a new learner like me, i have learnt so much. 

  • Fathia mahmoudJanuary 2, 2021 Reply

    please tell me what is the referance of the above information  

    • billJanuary 2, 2021 Reply

      The EMP method is presented in Dr. Wheeler’s book EMP III Evaluating the Measurement System Process. Dr. Wheeler’s book is highly recommended (

  • LeomarFebruary 23, 2021 Reply

    ndc were not considered at these oublecation, we need to consider it or something similar for EMP as an approval criteria?

    • billFebruary 23, 2021 Reply

      No, ndc is not considered in determining if the measurement system is good.  I am not sure what it adds.  

  • Mário LimaDecember 23, 2021 Reply

    The fourth column lists the chance of detecting a ± 3 standard error shift within ten subgroups. Imagine now that I have historical data that forms more than 10 subgroups and I make a control chart with these subgroups. The chance of detecting a ± 3 standard error shift is sill the same or it will varies since I have more than 10 subgroups? Thank you for your topic's explanation, it really helped :-)

    • billDecember 27, 2021 Reply

      It is still the same for those ten subgroups.  Overall, it changes as the number of subgroups increase.

  • billAugust 18, 2023 Reply

    There are not set values for EV, AV and PV. They simply give yo insights on where you can begin to improve the gage R&R.

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