The following is a chapter from Praveen Gupta's The Six Sigma Performance Handbook, which gives results-oriented help with Six Sigma initiatives. With this handbook, you will learn how to optimize performance and sustain breakthrough results. This book also gives a quick, straight forward tutorial on the use of the statistical tools which form the bases for Six Sigma project success. The handbook shows you how to simplify Six Sigma methods for cost-effective implementations that work best in your organization.