High-quality disaggregated data is an essential input for smart and transparent decision-making, including in support of the post 2015 agenda and its means of implementation, and can improve policy-making at all levels. A focus on quantitative and qualitative data, including open data, and statistical systems and administrations at the national and subnational level will be especially important in order to strengthen domestic capacity, transparency and accountability in the global partnership. National Statistical Systems have a central role in generating, disseminating and administering data. They should be supplemented with data and analysis from civil society, academia and the private sector.