iSixSigma

FMEA RPN

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  • #33500

    ROSS
    Member

         The formula for RPN is  S*O*D(s:SEVERITY;o:OCCURENT;d:DETECTION), and the question is how should we get the s/o/d, from historical data or evaluations from process team?  Thanks very much!

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    #90671

    DaveG
    Participant

    Get SOD with 1 or more methods:
    1) Use instructions in your FMEA document – the AIAG booklet gives clear descriptions ranked 1 – 10 for S, O and D;
    2) Make your own standard and apply it – make it as objective as possible so all teams produce consistent RPNs – by all means, use data!  RPNs and FMEAs are meant to be dynamic, so on a periodic basis they should be reviewed, updated with the most current process state, and RPNs recalculated based on actual performance data
    3) Other posters will have other ideas

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    #90673

    Ron
    Member

    FMEA is a defined process. The key to making the process work is the level of knowledge contained by the subject matter experts participating.
    Severity is a judegement: you should have defined factor prior to beginning the FMEA agreed to by the participants. When in doubt utilize the standard format.
    Probability of occurrence: It would be great if you have historical data, if not once again you are subject to the consensus view
    Detectability: This should be hard factual evidence, do you have a system in place and will it catch all possible occurrences?
     

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