"According to my review of history and theory, four forms of organization — and evidently only four — lie behind the governance and evolution of all societies across the ages:" Overview of social evolution (past, present, and future) in TIMN terms
TIMN stands for: Tribal, Institutional, Market and Network.
This is a compelling way to look at the evolution of society and wonder if it can be applied to medical teaching and learning too.
Tribal - apprentice and mentor within a particular practice
Institutional - traditional university / college teaching
Market - the open market for CME/CPD and courses
Network - courses such as the Postgraduate Diploma in Diabetes at Cardiff perhaps, Wenger's communities of practice living in digital habitats, CCK09 of course ...
My only anxiety is that evolution suggests a one-way and one correct way for a society to evolve. Working in a network with social equity, justice, information overload and rewarding connections but I'm sure there are times when the other forms of organistion would work better.