You can also calculate capability indices, which are ratios of the specification tolerance to the natural process variation. These graphics help you assess the distribution of your data and verify that the process is in control. You can assess process capability graphically by drawing capability histograms and capability plots. Process capability indices provide a common metric to evaluate and predict the performance of processes. The output of a process can be product characteristic or process output parameter. A process is a unique combination of machines, tools, methods and personnel engaged in providing a product or service. The process needs to be in control before you assess its capability if it is not, then you will get incorrect estimates of process capability. You determine capability by comparing the width of the process variation with the width of the specification limits.
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