Smith arrived at a desired DPMO of 3.4 for Motorola, a six sigma deviation from the mean. And thus, Motorola’s Six Sigma methodology was born. The method encouraged absolute commitment to meeting this quality threshold. When it went unmet, advanced analyses would be put in place to determine which part of the process needed refinement, then identify and implement a solution.
Please read the originial post here: https://sites.google.com/view/lean6sigma/5-lean-six-sigma-principles-you-should-adopt