![]() The garage defines the specification limits the car defines the output of the process. “You must have a Cpk of 1.33 or higher to satisfy most customers.” Joe Perito “Consider a car and a garage. Cpk will be higher only when you r meeting the target consistently with minimum variation.” Ajit In such case also Cpk will be lower, but Cp will be high. On the other hand, a person may be on average exactly at the target, but the variation in performance is high (but still lower than the tolerance band (i.e., specification interval). A person may be performing with minimum variation, but he can be away from his target towards one of the specification limit, which indicates lower Cpk, whereas Cp will be high. 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 “Cpk measures how close you are to your target and how consistent you are to around your average performance. The larger the index, the less likely it is that any item will be outside the specs.” Neil Polhemus “If you hunt our shoot targets with bow, darts, or gun try this analogy. Interpreting Cp, Cpk “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. Jump To The Following Sections: Ĭalculating Cpk and Ppk Definitions Cp= Process Capability. Thanks to everyone below that helped contributed to this excellent reference. This article will present definitions, interpretations and calculations for Cpk and Ppk though the use of forum quotations. Another way to report process capability and process performance is through the statistical measurements of Cp, Cpk, Pp, andPpk. The higher the sigma level, the better the process is performing. Process Capability (Cp, Cpk) and Process Performance (Pp, Ppk) – What is the Difference? In the Six Sigma quality methodology, process performance is reported to the organization as a sigma level. CPK PPK PROCESS CAPABILITY & PROCESS PERFORMANCE ![]()
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