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Over ten years, 6sigma management is applied a lot in the part of indirect business as well as the manufacturing industry. But it has still been used restrictively the technique used on DMAIC that is a basic Roadmap of 6 sigma. This paper finds the improving skills that is used in the parts of manufacturing and indirect business and demonstrates their available scope with 6sigma projects. And this indicates which skills for improving are used valuable on each step of DMAIC with a systematic classification.