What Is Cpk in Laymans Terms

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Posted by: Neil Polhemus
Posted on: Wednesday, 9th May 2001, 12:00 AM.

Cpk is an index (a simple number) which measures how close a process is running to its specification limits, relative to the natural variability of the process. The larger the index, the less likely it is that any item will be outside the specs. If you like, you can then relate specific values of Cpk to the proportion of items which would be beyond the specs. Don't start talking about standard deviations. If he has an MBA, he will be used to indices, which are designed to hide the complexity behind a calculation and come up with a single number which is easy to understand.

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