The Psychology of Quality and More

A Toolbook for Quality Improvement and Problem Solving (contents)

Process Capability: Practical variations

The Quality Toolbook > Process Capability > Practical variations

When to use it | How to understand it | Example | How to do it | Practical variations

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Practical variations

• Cpm is an alternative Process Capability index which gives a measure in a single calculation. The figure below. shows how to calculate Cpm, using the same data as before.

Fig. 1. Cpm calculation

• Set up an optimum environment before measuring the Process Capability, rather than measuring under normal working conditions. For example, use new tools, most skilled people, graded materials, slower execution, etc. This will give a measure of the potential of the process. The difference between this and the measure taken from the normal working Process Capability will give some indication of the possible improvement that may be made.

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