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This review is from: Six Sigma for Managers: 24 Lessons to Understand and Apply Six Sigma Principles in Any Organization (McGraw-Hill Professional Education Series) (Spiral-bound)
This is a good primer for anyone trying to get a basic understanding of Six Sigma. It steps through the phases and then highlights key tools. It doesn't go into depth but it gives you enough to know if you want to invest in certification or run screaming for the hills.