Criticism
The Corruption Perceptions Index has drawn increasing criticism in the decade since its launch, leading to calls for the index to be abandoned. This criticism has been directed at the quality of the index itself, and the lack of actionable insights created from a simple country ranking. Because corruption is wilfully hidden, it is impossible to measure directly; instead proxies for corruption are used. The CPI uses an eclectic mix of third-party surveys to sample public perceptions of corruption through a variety of questions, ranging from "Do you trust the government?" to "Is corruption a big problem in your country?"
The use of third-party survey data is a source of criticism. The data can vary widely in methodology and completeness from country to country. The methodology of the Index itself changes from year to year, thus making even basic better-or-worse comparisons difficult. Media outlets, meanwhile, frequently use the raw numbers as a yardstick for government performance, without clarifying what the numbers mean. A local Transparency International chapter disowned the index results after a change in methodology caused a country's scores to increase—media reported it as an "improvement". Other critics point out that definitional problems with the term "corruption" makes the tool problematic for social science.
The index mainly provides a snapshot of the views of business people and country analysts. In comparison, the questions in the Eurobarometer surveys 64.3 (2005), 68.2 (2007), 72.2 (2009), and the Flash Eurobarometer 236 (2008) established by the European Commission for all of the 27 European Union members states ask the perceptions and experiences of the general public. In general, the results show a very large divergence between the perception of living in a corrupt country by the general public and the experiences of corruption in everyday life.
Aside from precision issues, a more fundamental critique is aimed at the uses of the Index. As a source of quantitative data in a field hungry for international datasets, the CPI can take on a life of its own, appearing in cross-country and year-to-year comparisons that the CPI authors themselves admit are not justified by their methodology. The authors state in 2008: "Year-to-year changes in a country's score can either result from a changed perception of a country's performance or from a change in the CPI’s sample and methodology. The only reliable way to compare a country’s score over time is to go back to individual survey sources, each of which can reflect a change in assessment."
The CPI produces a single score per country, which as noted above, cannot be compared year-to-year. In the late 2000s, the field has moved towards unpackable, action-oriented indices (such as those by the International Budget Partnership or Global Integrity), which typically measure public policies that relate to corruption, rather than try to assess "corruption" as a whole via proxy measures like perceptions. These alternative measures use original (often locally collected) data and so have the same non-comparability problem as the CPI and are limited in scope to specific policy practices (such as public access to parliamentary budget documents) and so they are only an indicator of visible corruption/policy corruption.
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