An inclusive and fully owned aid policy establishing the overall framework for development co-operation at the country level, agreed to by all key stakeholders, is essential for implementing international commitments on maximising the effectiveness and results of development co-operation. As a member of the Steering Committee of the Global Partnership for Effective Development Co-operation (GPEDC), the IPU has commissioned this basic guidance note for development cooperation practitioners and stakeholders, including governments, parliamentarians, civil society and providers of development co-operation. The note aims to make stakeholders better advocates for the adoption or improvement of national aid policies, participating in their implementation and taking measures to strengthen mutual accountability. It draws on a detailed review of 26 national aid policies, some cited as best practice examples.