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to know more application of six sigma limit

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  • #33369

    Tejas
    Member

    Why do industries never go beyond the six sigma limit? We are in the world of zero defect, there should not be concept like a sigma limit. Are you in agreement with me?

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    #90107

    DaveG
    Participant

    How do you quantify your defect rate?  0, 0.00, 0.0000, etc.?

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    #90108

    Vikas M. Valsang
    Member

    Industries can beyond go beyond Six Sigma limit. There is no limit (theoritically). At Six Sigma level, 99.9966 % of the variables will fall within the specification limit.
    What does it mean, 3.4 defects in a million opportunity. So for an airline industry, operating at 6 sigma means, 3.4 mishaps for every million flights. There are airlines which have operated above 6 sigma as well. 
    So there is no concept like a six sigma limit ! 

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    #90119

    Tony Burns
    Member

    We are not in a world of zero defects. Low defect rates are only possible when a process is behaving predictably. A process that is in statistical control is operating as consistently as it can. A process that is not in control, is in a state of chaos and there is nothing that can be done to prevent defects.
    Our focus should be on bringing process to a state of statistical control.
    Dr Tony Burns
    http://www.q-skills.com
    [email protected]
     

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    #90126

    Hong Xu
    Participant

    Dear All:
    A first time participant.
    I want to start a thread related to this post.
    Based on my limited experience, I observe that special causes are a bigger problem causing most of the headachs in industries that I have been associated with, especially when common cause capability is already good. It is also a bigger challenge as special cause events are more difficult to measure, analyze, solve, and control. Before anybody jumps on it, I have to qualify it that this is just my LIMITED observation. By no means it is universally the case.

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