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Six
Sigma uses a variety of statistics to determine the best practices
for any given process.
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Statisticians and Six Sigma consultants study the existing processes
and determine the methods that produce the best overall results.
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Combinations of these methods will be tested and upon determining
that a given combination can improve the process, it will be
implemented.
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Six
Sigma stands for "Six Standard deviations from the arithmetic mean".
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Six
Sigma statistically ensures that 99.9997% of all products produced
in a process are of acceptable quality.
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Six
Sigma allows only 3.4 defects per million opportunities.
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If a
given process fails to meet this criteria, it is re-analyzed,
altered and tested to find out if there are any improvements.
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If no
improvement is found, the process is re-analyzed, altered and tested
again.
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This
cycle is repeated until you see an improvement.
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Once
an improvement is found, its documented and the knowledge is spread
across other units in the company so they can implement this new
process and reduce their defects per million opportunities.
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