![]() If the car is wider than the garage, it does not matter if you have it centered it will not fit. If the car is only a little bit smaller than the garage, you had better park it right in the middle of the garage ( center of the specification) if you want to get all of the car in the garage. ![]() The garage defines the specification limits the car defines the output of the process. “You must have a C pk of 1.33 or higher to satisfy most customers.” Joe Perito C pk will be higher only when you r meeting the target consistently with minimum variation.” Ajit ![]() In such case also C pk will be lower, but C p 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 C pk, whereas C p will be high. “ C pk measures how close you are to your target and how consistent you are to around your average performance. If your shots are falling in the same spot forming a good group this is a high C p, and when the sighting is adjusted so this tight group of shots is landing on the bullseye, you now have a high C pk.” 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 “ C pk 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 P p for the effect of non-centered distribution. A simple and straightforward indicator of process performance. ![]() Adjustment of C p for the effect of non-centered distribution. A simple and straightforward indicator of process capability.Ĭ pk= Process Capability Index. Thanks to everyone below that helped contributed to this excellent reference.Ĭ p= Process Capability. This article will present definitions, interpretations and calculations for C pk and P pk 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 C p, C pk, P p, and P pk. In the Six Sigma quality methodology, process performance is reported to the organization as a sigma level. ![]()
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