This is a free, online textbook offered by Book Boon.'Six Sigma is one of the most important developments in the field of business improvement. It is also one of the most over-hyped and misunderstood initiatives, leading to confusion and controversy. Those studying or working in the area need to understand not only the mechanics of conducting Six Sigma projects, or even implementing the wider initiative. They must also grasp the underpinning principles and logic. This book looks at both the academic and practical aspects of Six Sigma to give a deeper and more subtle understanding of how and why it works, and the limitations of the approach.'