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Why are group decisions so hard? Since the beginning of human history, people have made decisions in groupsfirst in families and villages, and now as part of companies, governments, school boards, religious organizations, or any one of countless other groups. And having more than one person to help decide is good because the group benefits from the collective knowledge of all of its members, and this results in better decisions. Right? Back to reality. Weve all been involved in group decisionsand theyre hard. And they often turn out badly. Why? Many blame bad decisions on groupthink without a clear idea of what that term really means.Now, Nudge coauthor Cass Sunstein and leading decision-making scholar Reid Hastie shed light on the specifics of why and how group decisions go wrongand offer tactics and lessons to help leaders avoid the pitfalls and reach better outcomes.