Six Sigma for Managers: 24 Lessons to Understand and Apply Six Sigma Principles in Any Organization (The McGraw-Hill Professional Education Series) by Greg Brue
Six Sigma can be a complex and intimidating subject, with its emphasis on statistics and charts. Novices to the Six Sigma approach will appreciate a slim primer that gives an overview and practical advice on how to implement Six Sigma practices in everyday business. "Six Sigma for Managers" offers 24 lessons that explain the fundamentals of Six Sigma in bite-sized chapters. For eliminate defects, cut costs; use statistics; choose projects carefully; measure smart; and, map the process.
Only a very small book, but it's a really handy, concise guide to Six Sigma techniques (at a high level) which would be a really useful tool for managers.