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Single institution/sector perceived to be most affected by corruption [being] Parliament/
What are the sources of data for the CPI?
The 2007 CPI draws on 14 different polls and surveys from 12 independent institutions. TI strives to ensure that the sources used are of the highest quality and that the survey work is performed with complete integrity. To qualify, the data must be well documented and sufficient to permit a judgment on its reliability. All sources must provide a ranking of nations and must measure the overall extent of corruption. This condition excludes surveys which mix corruption with other issues, such as political instability, decentralization or nationalism.