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Process Standard Deviation is directly related to process variation and high process variation is not good. A good way to view Process Sigma (or process performance) is to estimate how many process Standard Deviations would fit within the process requirements…
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Jef Spencer

Jef Spencer is a Six Sigma Consultant, Trainer and Project Coach with over 25 years of experience. He holds a Bachelor and Master Degree from Carnegie Mellon University and is ASQ and SME Certified.