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Transparency International (TI) defines corruption as the abuse of entrusted power for private gain. This definition encompasses corrupt practices in both the public and private sectors. The Corruption Perceptions Index (CPI) ranks countries according to the perception of corruption in the public sector. The CPI is an aggregate indicator that combines different sources of information about corruption, making it possible to compare countries.
The 2010 CPI measures the degree to which public sector corruption is perceived to exist in 178 countries around the world. It scores countries on a scale from 10 (very clean) to 0 (highly corrupt).
Perceptions are used because corruption – whether frequency or amount – is to a great extent a hidden activity that is difficult to measure. Over time, perceptions have proved to be a reliable estimate of corruption. Measuring scandals, investigations or prosecutions, while offering ‘non-perception’ data, reflect less on the prevalence of corruption in a country and more on other factors, such as freedom of the press or the efficiency of the judicial system. TI considers it of critical importance to measure both corruption and integrity, and to do so in the public and private sectors at global, national and local levels. The CPI is therefore one of many TI measurement tools that serve the fight against corruption.