每日原则: 3-5人的效率高于20人

3-5个精明强干且善于思考的人以开放心态寻求正确的答案，通常能找到问题的最佳答案。组建更多人的团队看起来很有吸引力，但如果人太多，合作的效果可能适得其反，即便其中有很多聪明、有才华的人。给团队增加成员的共生效果是逐步递增的（2+1=4.25），直至到达一个顶点，过了这点后效率递减。这是因为：（1）边际效益随团队人数增多而减少（两三个人可以贡献大部分重要的观点，增加更多人不会有更多的好点子）；（2）团队人数过多时，其互动效率低于小团队的互动效率。当然，实际中最好的结果取决于人员的素质和他们带来的不同观点，以及团队管理的好坏。

Three to five smart, conceptual people seeking the right answers in an open-minded way will generally lead to the best answers. It may be tempting to convene a larger group, but having too many people collaborate is counterproductive, even if the members of the larger group are smart and talented. The symbiotic advantages of adding people to a group grow incrementally (2+1=4.25) up to a point; beyond that, adding people actually subtracts from  effectiveness. That is because 1) the marginal benefits diminish as the group gets larger (two or three people might be able to cover most of the important perspectives, so adding more people doesn’t bring much more) and 2) larger group interactions are less efficient than smaller ones. Of course, what’s best in practice depends on the quality of the people and the differences of the perspectives that they bring and how well the group is managed.

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