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A long-standing criticism from the international community is that the index relies on the perception of corruption to create its rankings.
The rankings are based on questionnaires with "experts and business leaders," according to the group. They're asked about a wide range of factors, from evidence of bribery to protections for whistleblowers.
That vagueness can make it difficult for local anti-corruption advocates and nonprofits to figure out what they need to do to fight the scourge in their countries: "Should I try to make the police less corrupt or should I join a government partnership to reduce corruption?" says Kenny.