Beside Lean, Six Sigma counts among the most popular performance improvement approaches. Based (and named) upon statistical data and tools, Six Sigma’s aim is to speak with data and facts. It is the most “scientific” methodology in the Theory of Constraints – Lean – Six Sigma (TLS) trio.
Once thought to replace Lean, Six Sigma rather completes it. Despite a certain overlap, many comparisons try to clearly discriminate what is in the Lean and what in the Six Sigma pigeon holes. The following presentation is a nice summary for both Lean and Six Sigma.