iSixSigma

DPMO

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  • #32949

    manager
    Participant

    Can anyone give me a layman’s explanation of why you use defects per million?
    In an introductory class, I was told it levels the field when you compare apples to oranges.
    I still don’t understand

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    #88552

    fsutculer
    Participant

    Quite simple!
    With ppm yo can show small figures  as  if they were big figures.
    1000 ppm is bigger then 0,1% from right brain point of view.
    Regards         

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    #88556

    Terry
    Member
    #88560

    marklamfu
    Participant

    It is for striving for Zreo defect and enhacing the sensitivity to defect, 0.1% defect rate =1000 ppm, 0.01%=100 ppm, 0.001% =10 ppm, when quality achieved a high level, using % to measure defect seem not sensitive, e.g. six sigma process defect is 3.4 ppm, (0.00034% seem ….), as if  to buy gold, we say to buy 10 gram not say to buy 0.001 kg , because the kg is not sensitive for this case.

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    #88561

    Rocky
    Member

    Dear Manager,
    It is nice to know that your interested for this knowledge. You can help for better deployment of increasing number of stagnant BB.
    DPMO is a management metric to determine/compare the performance of plant ranges product. Your right, to compare apple to orange. If your company engage in manufacturing television and washing machine, you can compare manufacturing performance of each product by DPMO. Thus, you can decide where improvement is needed most.
    DPMO is related to Sigma Level. Many applicable tables is available for this purpose. In Six Sigma manufacturing industry, people are talking in Sigma Level instead of DPMO. (e.g . ” Our TV manufacturing process is operating at 4.67 Sigma Level (762.26 DPMO) while washing machine is at 4.35 Sigma Level (2,186 DPMO)) Thus, a need for improvement on washing machine processes is required.
    Since the product are divided by it’s own number of oppurtunity, the result evens up. The product are now comparable to each other. 
    Rocky. 
     
     

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    #88564

    manager
    Participant

    I think I got it! Thanks to everyone for their helpful comments.
    (I’ll be back)

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