Difference between Process Capability (Cp) and Process Capability Index (Cpk)


Statistical Process Control (SPC) metrics like Cp and Cpk are crucial for assessing and maintaining the quality of manufacturing processes.


Cp (Process Capability) measures the potential capability of a process to produce output within specified limits, indicating how well the process can meet specifications when it is centered. 


Cpk (Process Capability Index) considers both the process variability and its mean, providing a more accurate representation of how consistently the process produces within specification limits. Together, these metrics help identify areas for improvement, reduce variability, and ensure consistent product quality.


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