We all want to work on teams that just click. But you have also worked in dysfunctional ones. Prof Robin Dunbar has devoted his career to studying why teams work and he is the father of the Dunbar number, which observes that humans can only make meaningful connections with 150 other people. He also found that team dynamics change when you go from team sizes of 5 to 15 to 50 to 150.

I don't know if Jeff Bezos had the Dunbar number in mind when he said that teams in Amazon had grown too large when they could not be fed with just one pizza.

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