Transparency International

Transparency International is an international non-governmental organization founded in 1993 and headquartered in Berlin, Germany. It works on issues of public-sector and corporate corruption through research, advocacy, and a network of independent national chapters operating in numerous countries. The organization is widely known for its annual Corruption Perceptions Index, which ranks territories by perceived levels of public-sector corruption, and for related measures such as the Global Corruption Barometer. Its outputs are based on surveys, expert assessments, and aggregated third-party data. The indices reflect perceptions and reported experience rather than direct measurement of corrupt acts, and the organization publishes its methodologies alongside its findings.