Control limit

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Part of a control chart, line(s) used to judge the stability of a process. On a Shewhart chart, and others, these line(s) represent control limits, or action limits. Other than on acceptance control charts, the control limits are not specification limits. The lines are statistically determined boundaries for the expected deviations from the center line due to random causes alone.

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Control chart factor
A numerical value, typically varying with sample size, is used to convert specific statistics or parameters to control chart center lines or control limits.
Discrimination
The ability of a measurement system to differentiate between values of a characteristic. The discrimination should be small compared to the characteristic variability, tolerance, or control limits.

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