Control limits are statistical limits that reflect the extent to which sample statistics such as means and ranges can vary due to random variation alone.

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Control limits are used in statistical process control (SPC) to distinguish between common cause variation (random variation due to normal process variation) and special cause variation (variation outside of normal process variation). The control limits are typically set at +/- 3 standard deviations from the mean of the sample statistics, and any data points that fall outside of these limits are considered to be indicative of special cause variation.

Control Limits Are Statistical Limits That Reflect the Extent to Which