Six Sigma is a data driven problem solving approach with the objective of increasing profits by reducing the defects (improving effectiveness) in a process. Defect reduction happens in two ways - first, reducing the variation in the process, second, by moving the actual mean closer to the target mean.
Six Sigma is all of the following
Metric: 3.4 defects per million opportunities
Methodology: DMAIC / DMADV frameworks
Management System: all business units are aligned to key improvement efforts
Philosophy: encompasses all of the above and a state where it becomes a way of life.
Applause for all the respondents- Prashanth Datta, Sarita Shonkhala, Hari Shyam Gupta, R Rajesh, Manjeet Sachdeva, Shivkumar Samant, Devanand, Prabhakaran Sundaramurthy, Mohiuddin G M, Rajesh Chakrabarty