The process capability index measures the capability of the process to produce units whose dimensions fall with in the specifications.

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The process capability index is used to evaluate whether a process is capable of producing products that meet the specifications. It measures the overall performance of the process by comparing the range of process variability to the range of specification limits. A high value of the process capability index indicates that the process is capable of meeting the customer's requirements, whereas a low value implies that the process needs improvement.

The Process Capability Index Measures the Capability of the Process