Variation in behavior leads to variation in results.
The Shingo Model for Operational Excellence
Understanding Process Variation
Process variation is the root of many quality problems. The ability of a process to produce results that conform to requirements is an indicator of its capability. Conformance is often assessed by the degree to which a process is performed within its control parameters or a product meets the form, fit or functional requirements specified by engineering or customer. Process capability can be evaluated by comparing output results to a process target (mean), data variation (standard deviation) or proportions (e.g. percent good vs. bad). Figure 1.1 visualizes the benefit of shifting a process ...
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