Six Sigma is a corporate quality improvement system that focuses on identifying and avoiding variations that lead to defects. Defects can take the form of a faulty part, an incorrect customer bill, and everything in between. Six Sigma uses sophisticated data collection and statistical analysis to identify and correct process errors with the ultimate goal of reducing the number of defects to 3.4 per million opportunities. Historically, books on Six Sigma have been aimed at managers and process engineers involved with implementing Six Sigma programs. But recently books aimed at employees not directly involved in Six Sigma implementation have been released and have become the best-performing books on the topic. The Pocket Idiot's Guide to Six Sigmais aimed at this same audience, and The Pocket Idiot's Guide brand and format are a perfect fit for those looking for a quick, easy-to-understand overview of Six Sigma.