Developing from shop–floor to strategic level
Interesting thing in both lean and six sigma that they have many things in common and most obvious are their origin and evolution. Six sigma and lean are two practices which initially originated from Japanese quality methodologies and tools. Despite they became most popular in the West; both of them are combination of tools used in Japan. Among different improvement Japanese tools six sigma and lean was organized so that to target particular problem, faced at different times by the West and Japan (poor quality vs. deficit of resources). The second issue is their evolution. Nowadays six sigma and lean are presented as mature methodologies, which developed beyond their origins, initially they regarded as operational level improvement tools and today they regarded by many as business strategies and even organizational philosophies.