On this podcast, and in the world of science advice studies generally, we spend a lot of time discussing the science-policy interface and what should exist on the 'science' side of it in order to most effectively support policymaking. But Professor Sir Geoff Mulgan asks a different question: what happens on the other side of the interface, when policymakers are landed with a vast array of knowledge, theory and opinion, and have to somehow construct from that — and their own political and economic realities — an intelligible way forward.