High Customer satisfaction,
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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)
Since you need to improve customer satisfaction and reduce waste in your work, then you definitely need to apply the Six Sigma method.
The book is simple to understand, quick to read, as it is presented concisely, with given examples which help understanding and gives you the basics of this complex argument. I liked.
I would recommend the book not only to technician or engineer, but any entrepreneur or businessman who cares of customer satisfaction.