A Motorola engineer in the 1980s discovered something shocking.
Less than 5% of their products reached the final assembly station without needing repair.
He refused to accept it. He stopped measuring defects as a percentage — and started measuring them per million opportunities.
Six Sigma was born.
The goal:

3.4 defects per million opportunities. Not zero — but as close as physics allows.

What does your sigma level actually mean?

Most companies are operating at 3 sigma. They just don’t know it.
The DMAIC roadmap — how Six Sigma actually works:

Define → Scope the project. What problem are we solving and for whom?
Measure → Establish your baseline. How bad is it right now?
Analyse → Find the root causes. Where is the variation coming from?
Improve → Generate and implement solutions. Redesign the process.
Control → Lock in the gains. Sustain, measure, and share learnings.
The results when you commit to it:
Motorola: 

$16 billion saved · 84% reduction in cost of quality · Productivity up 12% per year

General Electric:

$750 million in savings · Operating margin at 16.7% · 96% defect reduction

This is not theory. I have applied Six Sigma methodology across manufacturing, retail, and service operations in Egypt and Saudi Arabia for over 30 years.
The question is not whether Six Sigma works. It does.
The question is: at what sigma level is your process running right now?

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