>Spot a difference? The difference you point out doesn't matter because not everyone who uses "10x" in conversation is rigorously tracing it back to the 1987 D

>Spot a difference? The difference you point out doesn't matter because not everyone who uses "10x" in conversation is rigorously tracing it back to the 1987 DeMarco and Lister "Peopleware". And arguably, the "10x" had earlier origins in the 1968s studies by Sackman, Erikson, and Grant : https://www.google.com/search?q=10x+Sackman%2C+Erikson%2C+and+Grant https://www.google.com/search?q=10x+Sackman%2C+Erikson%2C+an... But again, that 1968 origin doesn't matter because many people are just using "10x" as a rhetorical synonym for "really good programmer that's much better than average".