The cover says: “a complete guide for green belts, black belts and managers at all levels”.
I agree, it’s a complete guide for the main aspects of Six Sigma. I have done internal training courses in my company related to Six Sigma: focused on DMAIC, DMADV, DFSS, and other tools.
This book goes in deep in the analysis and the statistical techniques, the courses I did goes more in the direction of understanding the processes and how to apply it.
Both learning initiatives have been complementary.
Four months ago I enrolled the Six Sigma Online course from Aveta Business Institute and I just completed all exams, so now I am Lean/DFSS Green Belt certified