11.1. Basic Concepts of Control Charts
The control chart is a tool for distinguishing between the common causes of variation (variation due to the system itself) and special causes of variation (variation due to factors external to the system) for a CTQ or a CTP (X). Control charts are used to assess and monitor the stability of a CTQ or an X (presence of only common causes of variation). The data for a control chart are collected from a subgroup or sample of items selected at each observation session.
Control charts can be divided into two categories that are determined by the type of data used to monitor a process. These two broad categories are called attribute control charts and measurement (variable) control charts.
In Chapter 2, “Introduction ...
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