The breakthrough strategy of Six Sigma is different in vocabulary, but not in concept, from the plan-do-check-act method, usually known as PDCA, that has been used in quality improvement for the past 70 years and in human learning throughout our evolution.7,8 The tools of TRIZ that are used in the improvement arena of Six Sigma are as shown in Table 14.1 as well as the relationship to the PDCA model.1 The difference in emphasis between Six Sigma and conventional

quality improvement methods is the focus at all levels of Six Sigma application on the business results of the proposed improvement.