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Lean Six Sigma Q&A -

With Process Sigma, is it true to say that Process Sigma increases when the Standard Deviation of the process deceases?

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 (or specifications). A higher number represents a better performing process.
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Lean Six Sigma Glossary -

Standard Deviation

Standard Deviation is a statistical measure that shows the average amount that values vary (aka "Dispersion") from the mean. A low Standard Deviation means that values cluster very close to the mean, while a high Standard Deviation means that values are spread out far from the mean. For a better…

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