| The 'Natural
Process Limits' are a measure of the variation
in a process. The natural process limits
are positioned at plus and minus three standard
deviations from the target.
Thus, if the process is stable, about 99.7%
of the process output will be within the
natural process limits.
If the natural tolerance limits
are within the specification
limits, the Cp
value is greater than 1.
|
