Thanks again for a great power workout yesterday, and welcome Dana and @brooking! The power framework I mentioned in our discussion is by David Kantor. My ex-colleague, Kristin Cobble, wrote an excellent blog post about his work at:

http://groupaya.net/blog/2012/01/david-kantor-the-secret-life-of-groups/

He’s also written a book about his work:

If any of you have resources to share, please add them in the comments!