6 Sigma is the highest, with over 99% of the yield being free of defects. Organizations should strive for 6 Sigma, but can readily attain 5 Sigma. Organizations with a 4 Sigma or lower have some ...

If you multiply that decimal by 100, that is your Yield ... which is the Sigma level, use the following formula: Z(short term) = Z(long term) + 1.5 Then you can determine Cpk using the ...