We must reject the idea—well-intentioned but dead wrong—that the primary path to greatness in the social sectors is to become more like a business. Most businesses, like most of anything else in life, fall somewhere between mediocre and good. Few are great. When you compare great companies to good ones, many widely practiced business norms turn out to correlate with mediocrity, not greatness. So then, why would we want to import the practices of mediocrity into the social sectors?