Why do we measure?

Six Sigma – iSixSigma Forums Old Forums General Why do we measure?

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    John J. McDonough

    We’ve all heard “You can’t improve what you don’t measure”.  To an engineer such as myself, that is pretty obvious, and I’ve always taken that statement at face value.
    I have an opportunity to make a presentation on why we measure to a group to whom that isn’t quite so obvious.
    Do any of you have links to material I can use to help explain this, perhaps some good examples or games?


    Johnny Guilherme

    I dont have any links, but an example for you. Just recently we commissioned a 14 head ointment filling machine (fully automated). Anyway we were told (by the manufacture of the machine) that the filling into small tins could be controlled to the nth degree and so accuracy of fill volumes should not be a problem.
    During the factory acceptance testing I took lots of samples from each fillhead and I took samples over time. I then plotted the data and did the normal capability calculations. Guess what the data was all “over the show” and capability indices really bad. The manufacture did not believe what I was telling them, but my boss did.

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