A BusinessWeek article states that James McNerney's introduction of 6 Sigma at 3M experienced the influence of stifling creative imagination and reports its removal in the analysis purpose. It cites two Wharton School professors who declare that 6 Sigma leads to incremental innovation with the expense of blue skies research. https://collindrflu.blogdon.net/a-review-of-six-sigma-course-taking-service-44264711