B. Process improvement
Six Sigma is a set of techniques and tools for process improvement. It seeks to improve the quality of process outputs by identifying and removing the causes of defects (errors) and minimizing variability in manufacturing and business processes. It uses a set of quality management methods, mainly empirical, statistical methods, and creates a special infrastructure of people within the organization who are experts in these methods. Each Six Sigma project carried out within an organization follows a defined sequence of steps and has quantified value targets, for example, reduce process cycle time, reduce pollution, reduce costs, increase customer satisfaction, and increase profits.