What Is Cpk in Laymans Terms

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Posted by: Joe Perito
Posted on: Thursday, 10th May 2001, 12:00 AM.

CpK is a performance measurment that is affected by the amount of variation in your process and how close you are to target. The greated the amount of variation and/or the further you are off target the worse the performance. Take target shooting: Bullets outside of the target is undesirable variation. Bullets all over the target is better but still has a lot of variation and is undesireable. A nice tight pattern of bullets in the third ring of the target shows little variation...that's an improvement, but it's still not on target. A tight pattern "on" the bullseye is the best performance of all. The smaller the variation and the closer you are to target, the higher the CpK factor is. You must have a CpK of 1.33 or higher to satisfy most customers.

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