Six sigma is a set of methodologies and tools used to improve business processes by reducing defects and errors minimize variation and increasing quality and efficiency. The goal of six sigma is to achieve a level of quality that is nearly perfect with only 3.4 defects per million opportunities.
The term Six Sigma corresponds to a terminology associated with statistical Modeling of manufacturing processes. Six Sigma is associated with process improvements at businesses. Six Sigma addresses improvement in quality of process outputs by identifying and removing the causes of faults and lowering unpredictability in Manufacturing and Business Process. It uses statistical methods along with Quality Management Systems to develop a special infrastructure of people within the Organization.