GRECO's objective is to improve the capacity of its members to fight corruption by monitoring their compliance with Council of Europe anti-corruption standards through a dynamic process of mutual evaluation and peer pressure. It helps to identify deficiencies in national anti-corruption policies, with a view to prompting the necessary legislative, institutional and practical reforms. GRECO does not have a mandate to measure the occurrence of corrupt practices in its individual member States. Other organisations/bodies are better equipped to deal with this important matter. A widely known example is Transparency International (TI), which issues annually a Corruption Perceptions Index (CPI) - ranking more than 150 countries according to perceived levels of corruption, as determined by expert assessments and opinion surveys and other specialised reports such as Global Corruption Barometer and Bribe Payers Index.