The process capability ratio measures the specification limits over the control limits.

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The process capability ratio (CP) measures the specification limits (the range of values acceptable for the product or process) over the process control limits. It assesses the ability of the process to consistently produce products or services that meet customer requirements within the designated limits. The higher the CP, the better the process performance is, and the more capable the process is of meeting customer needs with minimal waste or defects.

The Process Capability Ratio Measures the Specification Limits Over the Control