A series of articles interrogating the concept of rigor in the context of impact evaluation in our work, by Keira Lowther

"One of the key challenges that we face relates to how we measure and evaluate this work. This stems from the unpredictable and tangled nature of complex adaptive systems, which do not lend themselves to traditional methods of measurement or evaluation. Partly this is because change does not happen in expected ways. It often happens in patches or bright spots, and often it’s two steps forward and one back. Capturing this kind of change requires different kinds of methods to those usually used in monitoring and evaluation."