More on Group Size

More interesting thoughts on group size here and here -- in this case, the best size for terrorist organizations.
UPDATE: See also this interview:

Semler believes that small is, if not beautiful, at least essential for people to know and trust each other. So, when the number of
people in a Semco unit hits the 100 to 200 mark it is split in two, like it or not. "No matter what the economics of scale might be in theory," he said, "we find a way of splitting it."