First Things First

Abstract:Process capability is defined as the best distribution a process can produce given its present design at a given point in time. The generally accepted process capability analysis entails two stages: 1) establishing process control; and 2) comparing process performance to customer requirements by calculating a process capability index. However, process capability analysis and improvement can be performed only on a process in statistical control. Applying process capability to processes that are not in statistical control can result in unreliable estimates of process capability. Although it goes against the conventional wisdom that the determination of process control and process capability should be done sequentially, the concurrent assessment of control and capability is a practical and useful process assessment. This article proposes an additional way of looking at process capability analysis based on evaluating the potential of the process …

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--Brian Kral, 07-15-2014

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