Transparency International seeks to provide reliable quantitative diagnostic tools regarding levels of transparency and corruption, both at global and local levels.

The annual TI Corruption Perceptions Index (CPI), first released in 1995, is the best known of TI’s tools. It has been widely credited for putting TI and the issue of corruption on the international policy agenda. The CPI ranks more than 150 countries in terms of perceived levels of corruption, as determined by expert assessments and opinion surveys.

In recent years, TI has sought to develop other corruption measurement tools to complement the CPI. The Bribe Payers’ Index (BPI) assesses the supply side of corruption and ranks corruption by source country and industry sector. The Global Corruption Barometer (GCB) is a public opinion survey that assesses the general public’s perception and experience of corruption in more than 60 countries around the world.

For more information on how corruption can be measured, please visit Policy and Research