Perturbative QCD theory (includes our knowledge of alpha_s)
  Following 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. 
Yuri L. Dokshitzer (INFN, Milan and PNPI, St.Petersburg)