What is Process capability index?

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Accepted Answer

Process capability index is a statistical measure of a process's ability to produce consistent results within specification limits.

Process capability index is used to evaluate the ability of a process to meet customer requirements.
It is calculated by dividing the specification width by the process width.
A process capability index of 1 indicates that the process is capable of producing within the specification limits.
A process capability index of less than 1 indicates that the process is not capable of producing within the specification limits.
A process capability index of greater than 1 indicates that the process is capable of producing within the specification limits with room to spare.
Process capability index is often used in Six Sigma and other quality improvement methodologies.

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