Not a fan of 6sig, but I think FedEx and UPS should train their employees.
3.4 F**k up delivery out of 1 million package would be nice.

http://en.wikipedia.org/wiki/List_of...igma_companies


Sigma level Sigma (with 1.5σ shift) DPMO Percent defective Percentage yield Short-term Cpk Long-term Cpk
1 -0.5 691,462 69% 31% 0.33 –0.17
2 0.5 308,538 31% 69% 0.67 0.17
3 1.5 66,807 6.7% 93.3% 1.00 0.5
4 2.5 6,210 0.62% 99.38% 1.33 0.83
5 3.5 233 0.023% 99.977% 1.67 1.17
6 4.5 3.4 0.00034% 99.99966% 2.00 1.5
7 5.5 0.019 0.0000019% 99.9999981% 2.33 1.83