When the first edition of this book was published back in 1999, it was one of only a couple of books on the subject of Six Sigma. Now, hundreds of books, websites, and blogs on Six Sigma (and Lean Six Sigma) are sliced into many different specialties and perspectives. It is rewarding to note, though, that our work has stood the test of time: The Six Sigma Way has sold more than 200,000 copies and has been translated into more than 20 languages, and Forbes magazine called it “one of the most important business books of the past 20 years.”

When we wrote the first edition, Six Sigma was still not well understood in business circles: although Motorola had championed Six Sigma in the late 1980s, it was not really ...

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