Due to its nature, the scale of corruption is impossible to measure with complete accuracy. But there are informed estimates available, and Transparency International regularly publishes a number of assessments, surveys and indices which measure corruption:
CORRUPTION PERCEPTIONS INDEX
TI’s Corruption Perceptions Index (CPI) is the best known of our tools (see animation above). First launched in 1995 it has been widely credited with putting the issue of corruption on the international policy agenda. The 2011 CPI measures the perceived levels of public sector corruption in 183 countries and territories around the world.
GLOBAL CORRUPTION BAROMETER
The Global Corruption Barometer is the only world-wide public opinion survey on corruption
BRIBE PAYERS INDEX
The 2011 Bribe Payers Index (BPI) ranks the likelihood of companies from 28 leading economies to win resources-resources-business abroad by paying bribes.
PROMOTING REVENUE TRANSPARENCY
The 2011 Report on Oil and Gas Companies which is based on research conducted in 2010 and is an expanded version of a report published in 2008, rates 44 companies on the public availability of information on their anti-corruption programmes and how they report their financial results in all the countries where they operate.
TRANSPARENCY IN CORPORATE REPORTING
This study analyses the transparency of corporate reporting on a range of anticorruption measures among the 105 largest publicly listed multinational companies. Together these companies are worth more than US$11 trillion and touch the lives of people in countries across the globe wielding enormous and far reaching power.
DEFENCE COMPANIES ANTI-CORRUPTION INDEX 2012 (CI)
The CI analyses anti-corruption and compliance systems in 129 defence companies around. The next iteration to be published in spring 2015, will cover more than 160 defence companies.
GOVERNMENT DEFENCE ANTI-CORRUPTION INDEX 2013 (GI)
The GI measures the risk of corruption in 82 national defence establishments around the world. The next iteration, to be published in spring 2015, will cover more than 130 countries, including all of Africa.