Work with Control Limits

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Quality and Process Methods • Control Chart Builder • Work with Control Limits

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Work with Control Limits

Control limits are based on the performance of your process, and tell you about the variability in your process. Upper control limits (UCLs), center lines, and lower control limits (LCLs) are calculated from the data when a control chart is created. You can use these calculated control limits to tell you when your process has changed and adjustments need to be made.

It is important to note that control limits are different from specification limits, which are often used in capability analysis.

Table 3.9 Control Limits versus Specification Limits
Control Limits	Specification Limits
Calculated from data	Given by customer or design
Based on variability	Based on system requirements
Applied to summary statistics	Applied to individual measurements
Applied to process measurements, perhaps on product, perhaps not	Applied to product characteristics
The voice of the process	The voice of the customer

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Help created on 3/19/2020