If you want to calculate the impact of group size, you take the number of people on a team, multiply by “that number minus one,” and divide by two. Communication channels = n (n−1)/2. So, for example, if you have five people, you have ten channels. Six people, fifteen channels. Seven, twenty-one. Eight, twenty-eight. Nine, thirty-six. Ten, forty-five. Our brains simply can’t keep up with that many people at once.
