As Harvard Business Review has focused this month on U.S. competitiveness, one theme has been the challenge of training the next generation of leaders. Harvard Business School’s Bill George argued that in the coming decades, leading firms will require “substantial cadres of leaders capable of operating effectively anywhere in the world.” And Merck’s Mirian Graddick-Weir wrote of the need to develop more creative problem-solvers — leaders who can think “critically, analytically, and with imagination.”