Being a CEO at any of the world’s largest companies is among the most challenging roles in business. Billions, and even trillions, are at stake—and the fates of tens of thousands of employees often hang in the balance. Yet, even when “can’t miss” high-achievers win the top job, very few excel. Thirty percent of Fortune 500 CEOs last fewer than three years, and two out of five new CEOs are perceived to be failing within eighteen months.