#Lean six sigma black belt vs green belt driver#

Should six sigma and lean coexist in any organization? Six Sigma projects are of higher complexities while Lean projects are of moderate complexities.

#Lean six sigma black belt vs green belt driver#

The project length for a six sigma project is 2 to 6 months and for a lean is 1 week to 3 months.ĭata is the main driver in a six sigma project while demand is the main driver for lean. Six Sigma uses various approaches to process improvements whereas lean mainly use value stream mapping. Six Sigma has a longer learning curve and lean has a shorter one. Six Sigma has a flare to improve the cost of poor quality and Lean improves Operating costs.

Six Sigma aims at a process performance of 3.4 Defects per Million opportunity and Lean focuses on improving speed. From Improvement perspective, Six Sigma reduces variation and Lean reduces waste. One definition states, “Six Sigma is a business strategy and philosophy built around the concept that companies can gain a competitive edge by reducing defects in their industrial and commercial processes.” There are some explanations from the points of view of lean and six sigma purists. Six Sigma has been defined in a variety of ways. Taiichi Ohno summarized the essence of lean (TPS) as “All we’re trying to do is shorten the timeline from order receipt to collecting the cash for the goods or services provided.” Lean is about eliminating wastes, taking time out of processes, and create better flow. Toyota, in particular, is credited with making lean a well-known approach as embodied in the Toyota Production System (TPS). There is an ongoing debate in some organizations regarding the difference between lean and six sigma, and whether they are mutually exclusive.