David Ronfeldt of RAND (one of the authors of the brilliant book Networks and Netwars) continues his elaboration of a framework for societal evolution that he began in Tribes, Institutions, Markets, Networks in his new work:

IN SEARCH OF HOW SOCIETIES WORK
Tribes — The First and Forever Form
By: David Ronfeldt

Not only is it a great read, but it also has a lot of open-ended questions and thoughts for us to ponder.