Process Capability Analysis, and What to Do if it's Not a Bell Curve

William A. Levinson, P.E., is Keynote Speaker at ComplianceKey. He is the principal of Levinson Productivity Systems, P.C. He is an ASQ Fellow, Certified Quality Engineer, Quality Auditor, Quality Manager, Reliability Engineer, and Six Sigma Black Belt. He is also the author of several books on quality, productivity, and management, of which the most recent is The Expanded and Annotated My Life and Work: Henry Ford's Universal Code for World-Class Success.


The process capability index, and related process performance index, reflect the ability of a manufacturing process to meet specifications. A Six Sigma process has six process standard deviations between the specification limits and the nominal.
The traditional process capability indices, however, rely on the assumption that the process follows a normal (bell curve) distribution. When this is not the case, special but off the shelf methods must be used to achieve accurate and meaningful results.

Why should you attend this webinar?

Process capability studies are basic quality management activities, and they are often required by customers. They also go hand in hand with deployment of statistical process control (SPC) charts. The generally accepted practice relies on the textbook assumption that the process follows the normal or bell curve distribution, which is far more common in textbooks than in real factories. If the underlying distribution is non-normal, the process performance index can be inaccurate by orders of magnitude in terms of the nonconforming fraction (defects per million opportunities, DPMO). In addition, the traditional SPC charts will not function properly.

Meaningful process performance indices and SPC charts can, however, be calculated and deployed for non-normal distributions, and generally accepted off the shelf methods are available.

Areas Covered in the Session:

Who can Benefit:

Manufacturing and quality professionals

Webinar Id: LSHCWP001

Training Options:

Duration: 60 mins

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 $167 (Single Attendee)  $599 (Unlimited Attendee)

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