The institutional arrangements governing ACAs greatly varies across countries - including with regard to their level of specialisation and centralisation - based on the local governance context and the specific circumstances that brought them into existence. Some countries have established a separate and centralised institution exclusively dealing with corruption, while others have opted for strengthening the anti-corruption capacity of a set of existing institutions or for a combination of both approaches. Some have also created several specialised bodies with complementary and sometimes overlapping mandates.