ASQ - Statistics Division

‘Stop Light’ Control – Paper Appearing in Winter 1984 Newsletter

Abstract: Stop light control is a pre-control technique that allows detecting changes (special causes) in the process. The process is assumed to be in statistical control, the performance measure has a normal distribution, and the process capability is between 50% and 80% of the tolerance limits. The technique is easier to implement than control charts.

Keywords: Pre-control - Stop light control - Quality control

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