The control limits of a control chart are typically +/-

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Control limits of a control chart are typically placed at 3 standard deviation units from the process mean. This means that 99.7% of the data points should fall within these limits if the process is stable and in control. A control chart with control limits set at +/- 1 or 2 standard deviations would be too narrow and may flag false alarms or miss actual changes in the process. Setting the control limits to +/- 4 standard deviations would be too wide and may not effectively detect process changes in a timely manner.

The Control Limits of a Control Chart Are Typically +/-