Security, Group Size, and the Human Brain

If the size of your company grows past 150 people, it´s time to get name badges. It´s not that larger groups are somehow less secure, it´s just that 150 is the cognitive limit to the number of people a human brain can maintain a coherent social relationship with. The whole brain-size comparison might be bunk, and a lot of evolutionary psychologists disagree with it. But certainly security systems become more formalized as groups grow larger and their members are less known to each other.