Upper Control Limit (UCL)


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Upper Control Limit (UCL) - short version

(1) Control limit for points above the central line in a control chart.

(2) A line on a control chart used as a basis for judging whether variation from the data on the chart is due to special or common causes. Any point beyond the upper control limit is an indication of a special cause occurring. This limit is calculated from data collected on the system, it is not a specification or limit set by customers or management. Its symbol is UCL.



 



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