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Variation and Assignable Causes

What’s this relationship between variation and assignable causes? Variation is the key to CQI charts. The extent of variation in a process indicates whether a process is working predictably. When the variation between the points is large enough for the process to be out of control, the variation is determined to be due to non-natural or assignable (special) causes.

So how are these normal-predictable variance levels determined? One of the beauties of control charts is that the process itself determines the control limits. The process itself shows what can and can not be expected. The control limits are automatically calculated from the data produced by the process. These calculations are done painlessly by Statit’s software, no need to calculate them by hand. By definition control limits cannot be pre-assigned, they are a result of the process or the “voice of the process”. Control limits are NOT specifications, corporate goals, or the “voice of the customer”. These two concepts must never be confused. “Get real” might be a nice way of putting the concept of control limits vs. specification limits.

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What about these rules violations for determining if a series of points within the control limits is unnatural? The work done by Shewart and his colleagues gave them a base of empirical knowledge on which to base Rules Violations. For example, six points in a row steadily increasing or decreasing. These have been codified and are contained in the AT&T Statistical Quality Control Handbook. Statit Software uses these time- tested and industry proven standards to automatically check for rules violations. 

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