Sigma Process

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List Of Six Sigma Software Packages - Origin and Meaning of The Term "six Sigma Process" - Role of The 1.5 Sigma Shift
... As a result, the number of sigmas that will fit between the process mean and the nearest specification limit may well drop over time, compared to an initial short-term study ... To account for this real-life increase in process variation over time, an empirically-based 1.5 sigma shift is introduced into the calculation ... According to this idea, a process that fits 6 sigma between the process mean and the nearest specification limit in a short-term study will in the long term fit only 4.5 sigma – either because the process mean will ...

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