Six Sigma quality control Multiple Choice is a strategy-implementer's best, most reliable tool for simultaneously achieving top-notch product quality and low manufacturing costs. consists of a disciplined, statistics-based system aimed at producing not more than 3.4 defects per million iterations for any business process. consists of a disciplined, statistics-based system aimed at producing not more than 2.5 defects per million iterations for a manufacturing or assembly process. consists of a disciplined, statistics-based system aimed at fewer than 5.0 complaints per million customer transactions