Understanding Six Sigma: Concepts, Applications and Challenges includes seven excellent chapters that have been prepared using state-of-the-art methodologies by professional researchers in this domain from seven different countries. The chapters in the book are titled as follows: Sustainable Development of the Environment Using Six Sigma); DMAIC Six Sigma for Complex Processes Improvement); The Lean Six Sigma Methodology: Applications in Thoracic Surgery); The Link between Six Sigma and Business Performance); Integration of the Lean and Six Sigma Methodology to Improve Quality Performance in a Healthcare Organisation); Six Sigma: A Process Improvement Methodology); and Integrating Six Sigma into a Business Strategy: Workshop and Leadership.