You are demonstrating the inverse-carrot-problem: six-sigma was not invented by Welch and he was only one of many that talked about it: https://en.m.wikipedia.o

You are demonstrating the inverse-carrot-problem: six-sigma was not invented by Welch and he was only one of many that talked about it: https://en.m.wikipedia.org/wiki/Six_Sigma https://en.m.wikipedia.org/wiki/Six_Sigma