Six Sigma programs

utilize advanced statistical methods to improve quality by reducing defects and variability in the performance of business processes.

consist of a disciplined, statistics$-$based system aimed at producing not more than $2\mathrm{.}5$ defects per million iterations for a manufacturing or assembly process.

are based on three principles: $(1)$ all work is a statistically controllable process; $(2)$ no well$-$controlled process allows variability; and $(3)$ defect$-$free work requires tight statistical controls.

suggest that all activities can be controlled, employee empowerment is the best control tool, and $100$ percent control is possible.

radically redesign and streamline how an activity is performed.