2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48589Following the logic of the great Chinese warrior-philosopher Master Sun Tzu, "The rules of the military are five: measurement, assessment, calculation, comparison and victory", we address the problem of what we know, think we know, and think about the QCD coupling.Plenary talk at ICHEP 98, Vancouver; 20 pages, 5 figures; uses ltwol2e.sty (included)High Energy Physics - Phenomenologytext