What does sigma sigma stand for?

Answer 1

Six Sigma is a world-class management system for driving, achieving, and sustaining breakthrough improvements in every part of an organization. Through structured planning and systematic project execution, an organization leverages Six Sigma to achieve its most important business objectives.

Essentially, Six Sigma is about improving processes, or the way work gets done in an organization. This is where the rubber of performance improvement meets the road. If you operate your processes at Six Sigma quality, then you commit no more than 3.4 defects per million opportunities for defects. This means you have to operate your processes correctly the first time 99.9997 percent of the time!

That is - 3.4 defects in a million pieces.