Specification limits

You can specify the target values and limits for each measure.

Target: Indicates the setpoint of the process or product measurement. Often, the target is centered between the control limits (for an in-control process) or specification limits. You must enter a target value to calculate Cpm, a capability index that also considers how much the data deviate from the target.
Lower specification limit (LSL) and Upper specification limit (USL): Indicate the minimum or maximum acceptable value for the product or service. To perform a capability analysis, you must enter a lower specification limit, an upper specification limit, or both.
Lower action limit (LAL) and Upper action limit (UAL): Optional values that indicate an early warning sign to take action on the process. Usually, the LAL is greater than the LSL, and the UAL is less than the USL.
Reasonable lower limit (RLL) and Reasonable upper limit (RUL): Indicate values that identify unlikely measurements. Reasonable limits are used to flag data entry errors.
Absolute lower limit (ALL) and Absolute upper limit (AUL): Indicate values that identify impossible or extremely unlikely measurements. Absolute limits are used to prevent data entry errors. Reasonable lower limits must be greater than absolute lower limits, and reasonable upper limits must be less than absolute upper limits.

For more information on setting target values and specification limits, go to Specify specifications and other limits for each measure.