Process capability

The process capability is a measurable property of a process to the specification, expressed as a process capability index (e.g., Cpk or Cpm) or as a process performance index (e.g., Ppk or Ppm). The output of this measurement is often illustrated by a histogram and calculations that predict how many parts will be produced out of specification (OOS).

Two parts of process capability are:

  1. Measure the variability of the output of a process, and
  2. Compare that variability with a proposed specification or product tolerance
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