At TEDxUSC, business professor David Logan talks about the five kinds of tribes that humans naturally form -- in schools, workplaces, even the driver's license bureau. By understanding our shared tribal tendencies, we can help lead each other to become better individuals.

David Logan is a USC faculty member, best-selling author, and management consultant.

More about tribes, by the famous Seth Godin: http://www.ted.com/talks/seth_godin_on_the_tribes_we_lead.html