David Logan researches and writes on Tribal Leadership.  Interesting topic and I think we have much to learn from his work when it comes to better understanding how groups of people naturally organize around commonalities and bond to get work done.  Of particular interest to me is the size of tribes.  Logan states that tribes are predominantly between 20-150 people.

If 20-150 is the magic number for naturally occurring groups, maybe we need to rethink how we implement change on an enterprise level.  Instead of asking the question, how do we implement change across 1500 people in our organization, maybe the better question is how do we create tribes of people which have no more than 150 people in them and use this naturally occurring structure to better create relational bonds between tribe members and implement change faster and more effectively…