The best Six Sigma black belt handbook has been fully revised, updated, and expanded! This third edition has been updated to reflect the most recent ASQ Six Sigma Black Belt Body of Knowledge (BOK), released in 2015. Among the many additions are: more exercises, particularly to address the more difficult concepts; new tables and figures to clarify concepts; new content between the DMAIC parts of the book (that is, Parts IV VII) to help smooth the transition between phases and to better relate the underlying concepts of the DMAIC methodology; and more content that ensures that the black belt is fully trained in concepts taught to the green belt. The primary audience for this work is the individual who plans to prepare to sit for the Six Sigma black belt certification examination. A secondary audience for the handbook is the quality and Six Sigma professional who would like a relevant Six Sigma reference book. The accompanying CD contains 180 supplementary problems covering each chapter and a 150-question simulated exam that has problems distributed among chapters per the scheme published in the BOK. New to this edition, the problems are now fully worked so that readers can more readily follow the problem-solving process.