https://qz.com/work/1635960/whatever-happened-to-six-sigma/

“Six Sigma credentials are no longer held in the same regard.  Systems like Six Sigma appeal to managers because they are rooted in the pursuit of predictability, and all managers crave predictability, says PwC’s Pino. Knowing a business had been Six Sigma’d was a comfort to business leaders, because it means they have one less thing to worry about.

But simply following the steps of a process is no longer a guarantee of success, if it ever was. Business is increasingly complex and interconnected, and it seems unlikely any single system can tame it. The smart enterprise of the future will need a constantly evolving rotation of systems and skills, employed by adaptable and flexible workers. They will be harder to teach in a course, but they may outlast all the fads and fashions that preceded them. “