What is Cpk?

What is Cpk?

Our first blog in this process capability series explored the simple question “what is process capability?”. There were two parts to the answer:

Process capability is the range of values that you can expect to get from the process over an extended time period.

A process is capable if the range of expected values fall within the specification limits.

Since you are comparing two ranges – the range of output from the process to the range of the specs - it is natural to ask questions about how much these two ranges are different or overlap. This gave rise to numerical...

What is Process Capability?

You hear the term process capability a lot these days. Customers want to know your process capability. You want to know your supplier’s process capability. So, what is meant by the words process capability? For a process:

Process capability is the range of values that you can expect to get from the process over an extended time period.

Suppose your process involves filling bags with sand. Each bag is supposed to hold 50 pounds of sand. The process capability for this process is simply the range of values you expect for the bag weights over an...

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