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Surveys and Indices

Transparency International seeks to provide reliable quantitative diagnostic tools regarding levels of transparency and corruption at the 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 with putting TI and the issue of corruption on the international policy agenda. The CPI ranks more than 150 countries by their 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.

In parallel to these global indices and surveys, TI national chapters have engaged in a number of innovative efforts to measure corruption, transparency and governance, often combining objective and subjective data in their analyses. This section of the TI website also provides a platform for these valuable regional, national and local initiatives.