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Is Six Sigma a proprietary or non-proprietary methodolgy?

edited November 2012 in PM Certifications

Today, while preparing some questions on Project Quality Management, I may have found another hole in PMBOK® Guide, 4th Edition.

On page 190, Six Sigma is listed as one of the non-proprietary methodologies, but on page 199, it is listed as a proprietary methodology.

So, which is correct?

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