This one-year project is funded by the French Development Agency. The project has two aims. First, it will provide a conceptualisation of complexity in global policy making and develop operational criteria for its empirical measurement. Second, the project will conduct a statistical analysis of the impact of policy complexity on global health outcomes. The indicators of complexity will capture mainly two dimensions: development assistance for health (aid proliferation and fragmentation, proportion of multilateral and bilateral aid, proportion of governmental and nongovernmental aid, etc) and country embeddedness in global networks that diffuse health policy values and policies (centrality in networks of intergovernmental and nongovernmental organizations, spatial interdependence among countries, etc). The project will innovatively combine existing datasets to estimate the impact of various dimensions of complexity on health outcomes and health policies, such as child, maternal and adult mortality, immunizations, government spending on health, and health inequality