This report sets out a conceptual map for potential elements of a science-for-policy advisory ecosystem. The aim of this map is not to propose an ideal system, but rather to highlight how elements need to connect with each other at multiple levels; to allow us to ask how all involved in evidence production, mobilisation and use can act to support more effective system functioning. This paper assumes that the goal of a science-for-policy system is the delivery of relevant, robust evidence to people with the capacity to absorb and fully understand it, in order that it might inform their decision-making. The proposed indicators therefore help identify opportunities for support, intervention, and more strategic use of resources to improve supply and demand of evidence. If the system were working well towards this goal, we would see: — a research community resourced, able, and willing to do research to help government address challenges; — a government able to access relevant evidence to help inform their decision-making; — funders and intermediaries supporting excellent policy-relevant research and effective knowledge exchange; and — policies being made and implemented which generate positive social change.