Lean is an ever evolving philosophy based on proven principles and practices aimed at the elimination of waste (improving efficiency) with the objective of making every step, task, & activity create value for the customers. Lean is a continuing process of change involving everyone in the organization. Lean principles originated at Toyota.
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.
Lean Six Sigma
Lean Six Sigma is a combination of tools, techniques and best practices from both Lean and Six Sigma philosophies with an objective to simultaneously improve both Efficiency and Effectiveness of a process.
An application oriented question on the topic along with responses can be seen below. The best answer was provided by R Rajesh on 30th September 2018.
Applause for all the respondents- Manjula Pujar, Sitaram, Tina Arora, Saranya Subramanian, Yogesh Rathod, Manoj Kumar Alagesan, Rajesh Chakraborty, Kalpesh,