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Capability Indexes: Mystery Solved

Summary: Unless process improvement is driven by more than the need to improve an index number, management may be wasting time and money. Capability indexes are difficult to interpret and controversial to apply. To be effective, management must understand each index and select the appropriate one for the application. Index values are affected if the process is not in statistical control and has an increased standard deviation. Since each index provides different information, knowing what each means and how to calculate it will enable you to make the right corrective action. A description of each of the capability indexes and its appropriate use is provided.

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