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6.
Process or Product Monitoring and Control
6.1. Introduction
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| Reactions to out-of-control conditions | If the process is out-of-control, the process engineer
looks for an assignable cause by following the out-of-control action plan
(OCAP) associated with the control chart. Out-of-control refers to rejecting
the assumption that the current data are from the same population as the
data used to create the initial control chart limits.
For classical Shewhart charts, a set of rules called the Western Electric Rules (WECO Rules) and a set of trend rules often are used to determine out-of-control. |
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