ACAs can be tasked with supporting and coordinating activities for the development of national anti-corruption policies and plans, as well as ensuring their implementation. This chapter discusses an ACA’s main functions in relation to this mandate and the capacities needed. Anti-corruption policies (or national strategies, as they are defined in many countries) are a special challenge, as they include corruption prevention measures for use across the public sector, as well as measures to strengthen law enforcement and to implement international legal instruments like the UNCAC.