Institutional checks on corruption are central to virtually every reform strategy, but they do not come in any standard form, and are unlikely to succeed in isolation. Some are aimed primarily at bureaucratic corruption, some more at political corruption, and some of the most important operate in both realms. Anticorruption agencies (ACAs) have been established—sometimes repeatedly—in around a hundred societies but have an indifferent track record. They are most likely to succeed when supported by a range of other strong governing institutions. Transparency is also a common institutional reform, and it too has consequences that are varying and contingent on local and cross-border influences. Conflict of interest legislation, and whistleblower protections, are also important issues in numerous societies. Specific institutional controls, in the end, require sound supportive institutions of several sorts; even then, the political, economic, and social challenges of corruption control remain formidable.