From Whitman thought partner BTW...
BTW is a consulting organization with strong ties to TWI. One founder of BTW, Jill Blair, is on the Whitman board. BTW's latest newsletter has some interesting articles about philanthropy that is worth a read.
Kim Ammaann Howard, BTW's Director of Evaluation and Organizational Learning, wrote a wonderfully clear and concise article, Designing Learning Communities for Enhanced Impact. Check it out here.
If more grant makers and grantees actually did have effective learning communities, then there would be fewer situations described in this New York Times piece about some of the spectacular failures in the philanthropic world. (The evaluator in one of these studies was BTW.) Link also here.