Much of our business thinking is shaped by delusions that distort our understanding of the real reasons for a company's performance. The most pervasive delusion is the Halo Effect. When a company's sales and profits are up, people often conclude that it has a brilliant strategy, a visionary leader, capable employees, and a superb corporate culture. When performance falters, they conclude that the strategy was wrong, the leader became arrogant, the people were complacent, and the culture was stagnant.In fact, little may have changed -- company performance creates a Halo that shapes the way we perceive strategy, leadership, people, culture, and more. The Halo Effect unmasks these delusions and replaces mistaken thinking with a sharper understanding of what drives business success and failure. Drawing on examples from leading companies - and mercifully free of business jargon - The Halo Effect is for those thinking managers who want to separate fact from fiction in the business world.