I would Google Six Sigma and read up on the topic. It is too lengthy a discussion for the forum, I'd think.
The short version is that Six Sigma provides a mechanism for continuous improvement - whether you are trying to improve product quality, sales performance, on-time delivery, really doesn't matter. There is an entire metholodogy to implementing "control plans" to measure, monitor, and control these key business measures. Six Sigma provides a statistical mechanism to gauge whether a process is "in control" or "out of control", and can also be helpful for learning the capabilities of a process. Six Sigma, in its simplest terms, implies three standard deviations to either side of the center point, which, statistically, infers a range in which 99.9997% of values should reside for a process "under control".
There is also a concept called the "Western Electric Rules", which are a well accepted set of rules for determining whether or not a process is under control, and for providing some level of "prediction" (trends, chatter, etc.) of process drift.
The xMII SPC Charts and SPC Analysis action block provide an engine and UI for performing these analyses.
Best regards,
Rick Bullotta
Bluesky
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