Six Sigma programs and techniques

use advanced statistical methods to identify and remove the causes of defects $($errors$)$ and undesirable variations in performing an activity or business process.

utilize advanced statistical methods to achieve not more than $2\mathrm{.}5$ errors or defects per million iterations of each value chain activity a company performs.

utilize advanced statistical methods aimed at achieving fewer than $5\mathrm{.}0$ complaints per million customer transactions.