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Six Sigma is both a management practice as well as a capability
measure.
The fundamental definition
of Six Sigma capability refers to a process where "the
center of the process is away from the nearest specification
limit by six standard deviations of the process". The
customer of that process determines the specification limits
within which the process has to perform. Sigma capability
of a process is a measure and therefore can assume any integer
value - "doing six sigma" implies that we move towards
this level of sigma capability, not as a pre-requisite, but
more as a target destination on a journey.
Six Sigma as a management
practice refers to the business initiative undertaken at an
enterprise to systematically enhance the capability of its
business processes to better meet/exceed customer specifications,
resulting in a tangible business gain. This simplified definition
describes the implication of "doing Six Sigma".
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