Saturday, July 27, 2013

A Book Says "Lean Means Speed" & Lean Cannot Bring a Process Into Statistical Control?

From one of the seminal books on "Lean Six Sigma:"

I guess that's where the others learned this supposed "fact" to cite in their definitions of Lean and Six Sigma.

From the author's definition:

Lean cannot bring a process under statistical control? Good grief, that's not right.  Toyota does not use Six Sigma. Toyota doesn't have processes that are in statistical control?

The book furthers the falsehood that Lean is about speed and Six Sigma is for defects. We see this parroted in many other Lean Sigma books that followed.

Another comment that's incorrect, that Lean is primarily about speed:

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