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why million opportunities?

Six Sigma – iSixSigma Forums Old Forums General why million opportunities?

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  • #27690

    sreedher
    Member

    Dear all
    My question is very simple and that of a layman’s ‘Why do you have to measure your performance in the scale of a million”??
    rgds
    sreedher

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    #68136

    Rajanga Sivakumar
    Participant

    I guess it all started because originally six-sigma concepts were developed in Motorola in manufacturing and in manufacturing,  ppm – parts per million,  measurement is common.

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    #68142

    Al
    Participant

    It just makes it easier than trying to deal with things like comparing 99.9994% and 99.9996%

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    #68163

    sreedher
    Member

    what do you say about this!
    When we measure a product in terms of % defective, the result not necessarily indicate how intense were the defects in the defecive ones! where as when we convert into DPMO we are trying to evaluate the intense of defects (as this philosophy uses DPU concepts)
    Anybody agrees to it!
    Sreedher

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    #68164

    Al
    Participant

    Excuse me if I have missed the point.
    Your original question was why use ‘per million’ – my answer was because it is easier to talk abot 3 or 30 or 100 per million rather than a % value with a string of 9s.
    Now you have moved on to the topic of the definition of a defect.  I know this is often a difficult topic but generally the definition of a defect has to come from your customer. 
    If you try to define different levels of impact, the next step gets you to the point where you say ‘we will fix this level but not that level’.  The only criteria for differentiating defects has to be ‘does the customer consider it to be critical to quality’.

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