If your shots are falling in the same spot forming a good group this is a high cP, and when the sighting is adjusted so this tight group of shots is landing on the bullseye, you now have a high cpK." Tommy "If you hunt our shoot targets with bow, darts, or gun try this analogy. The larger the index, the less likely it is that any item will be outside the specs." Neil Polhemus "Cpk is an index (a simple number) which measures how close a process is running to its specification limits, relative to the natural variability of the process. Adjustment of Pp for the effect of non-centered distribution. A simple and straightforward indicator of process performance. Adjustment of Cp for the effect of non-centered distribution. A simple and straightforward indicator of process capability.Ĭpk = Process Capability Index. Thanks to everyone below that helped contributed to this excellent reference.Ĭp = Process Capability. This article will present definitions, interpretations and calculations for Cpk and Ppk though the use of forum quotations. The higher the sigma level, the better the process is performing.Īnother way to report process capability and process performance is through the statistical measurements of Cp, Cpk, Pp, and Ppk. In the Six Sigma quality methodology, process performance is reported to the organization as a sigma level.
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