“…This led us to "something new," the distinction between performance plateaus and performance asymptotes-an essential distinction for those who believe that performance could or should be better than it is. One route, plateaus, leads towards human training (e.g., Ericsson et al, 1993), whereas the other route, asymptotes, leads toward human factors engineering (e.g., Cockburn et al, 2014;Gray, John, & Atwood, 1993;Scarr, Cockburn, Gutwin, & Quinn, 2011). To put this as clearly as we can, a plateau exists when there is a better goal (or better method for implementing an existing goal).…”