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What Is Cpk in Laymans Terms
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Posted by: Ben
Posted on: Thursday, 10th May 2001, 12:00 AM.
Consider a car and a garage. The garage defines the specification limits; the car defines the output of the process.
If the car is only a little bit smaller than the garage, you had better park it right in the middle of the garage (center of the specification) if you want to get all of the car in the garage.
If the car is wider than the garage, it does not matter if you have it centered; it will not fit.
If the car is a lot smaller than the garage (six sigma process), it doesn't matter if you park it exactly in the middle; it will fit and you have plenty of room on either side.
If you have a process that is in control and with little variation, you should be able to park the car easily within the garage and thus meet customer requirements. Cpk tells you the relationship between the size of the car, the size of the garage and how far away from the middle of the garage you parked the car.
Hope this helps.
Message Thread:  | | Cpk Values by Dmitry Kiskatchi on Thursday, 3rd March 2005 |
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