The Cpk index measures the difference between desired and actual dimensions of goods or services produced.

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The Cpk index is a measure of process capability that indicates the level of variation that exists between the desired specification limits and actual process performance. It compares the width of the specification limits (the tolerance) to the distribution of the process data around the centerline to determine if the process is capable of producing products or services that consistently meet customer requirements. A higher Cpk value indicates a more capable process, while a lower Cpk value indicates poorer performance and more variation in the process output.

The Cpk Index Measures the Difference Between Desired and Actual