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Cp Process Capability Index

Cp is one of several indices used to measures Process Capability. Cp is used to predict potential process performance:

Where:

 USL, LSL Upper and Lower Specification Limits σ R The process standard deviation. It must be estimated by the range method. See Process Performance

When Cp was originally conceived a spread of 6 standard deviations was 'state of the art' quality. The '6' in the denominator was used so that a Cp value of 1 or greater indicated a 'capable' process. Since then standards have increased and now a minimum Cp value of 1.67 is usually required.

Cpk is a closely associated process capability index.

 Process Capability and Process Performance are covered in the MiC Quality course in Statistical Process Control. Try out our courses by taking the first module of the Primer in Statistics free of charge.
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