If the Cp value suggests a capable process, the C_pk value for the same process will also suggest a capable process.

Question

Quizplus · Accepted Answer

Cp and Cpk measure different aspects of process capability. Cp measures the potential capability of a process assuming it is centered between the specification limits, while Cpk also considers the actual location of the mean relative to the specification limits. A process can have a high Cp (indicating potential capability) but a low Cpk if the process mean is not centered, suggesting the process might not be capable.

If the Cp Value Suggests a Capable Process, the Cpk

If the Cp Value Suggests a Capable Process, the C_pk