... to healthcare silo before she learns whether she has cancer. The The Healthcare Quality Book82 Quality Improvement Systems, Theories, and Tools 83FIGURE 4.5Two Curves of Healthcare Quality Improvement ... Electric, and others in the 1980s and 1990s (Pande, Neuman, and Cavanagh 2000). The tools used in Six Sigmaare not new. The thinking behind this system came from the foundationsof quality improvement ... the term during the question-answer period ofDeming’s four-day seminar learned that lesson quickly and publicly. The Healthcare Quality Book74 Quality Improvement Systems, Theories, and Tools Tools,...