iSixSigma

Process Capability Index

Definition of Process Capability Index:

Used to find out how well the process is centered within the specification limits.It is denoted by Cpk.

Cpk = Cp(1-K)
Where, Cp = Process Capability

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K = 2(Design Target – Process Average) / (USL – LSL)

Design target is the actual specification targetted without +/- allowance.

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