iSixSigma

Kicab Castaneda-Mendez

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  • #196296

    Kicab Castaneda-Mendez
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    Validating the target can mean several things.

    If you mean is it worthwhile, then regression (linear or nonlinear) might be a useful tool. If you can show the relationship between number of tickets and some other metric, e.g., cost of resources to address them, then you could establish a target based on the ROI or gain.

    For noncompliance issues, I recommend establishing a financial basis for improvement. I would ask management why 30%–see if they have already made this connection, and if not, recommend that it be done.

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    #196295

    Kicab Castaneda-Mendez
    Participant

    The number of units is used as the denominator, not the number of tests. Thus, FTY = 75% and Yield with rework = 100%: 100 units passed out of 100 units tested. The difference (75% – 100% = -25%) is the rework and the cost of that rework is your waste.

    If you are not interested in improving, you can compare the cost of the rework to the cost of scrap to see which is better.

    If you are interested in improving, then whenever FTY < 100%, seek to find the reasons and address them.

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