Yup, in my experience, 40–50 is also about when a classroom changes from “small class” to “lecture hall” or needs a TA, for similar reasons. Plus the number of

Yup, in my experience, 40–50 is also about when a classroom changes from “small class” to “lecture hall” or needs a TA, for similar reasons. Plus the number of edges in a fully connected graph of relationships would exceed 1000 at this point, so the graph starts to partition itself: employees stop working directly with most of their colleagues and start dividing into more isolated “tribes”. And this goes on to affect the structure of their projects, e.g., software architecture[1]. [1]: https://en.wikipedia.org/wiki/Conway%27s_law https://en.wikipedia.org/wiki/Conway%27s_law