Transparency International intends to develop reliable quantitative instruments, which can be used to measure transparency and corruption both on local and international levels. The Corruption Perception Index, which was designed in 1995, is the most well-known instrument used by TI. Its widespread recognition has contributed to the fact that the institution and the topic of corruption has become one of the topics of international politics. TI’s Corruption Perception Index ranks the countries based on the “extent” of corruption assessed among public officials and politicians. It is a complex index, often called the "survey of surveys", which uses sources prepared by various independent and well-known institutions. These databases include business surveys prepared by experts to assess the extent of corruption.
Transparency International attempted to develop other instruments to assess the extent of corruption, which are intended to complement the Corruption Perception Index. The Bribe Payers’ Index is a survey monitoring bribery, which ranks 22 countries based on the inclination of their companies to use bribery during their foreign business operations. The Global Corruption Barometer is a public opinion survey, which assesses how the general public perceives and experiences acts of corruption.
Similarly to global indexes and surveys, TI’s national offices participate in joint and innovative attempts to assess the extent of corruption, transparency, and the quality of governance. These attempts often combine objective and subjective data analysis.
Transparency International publishes its annual Global Corruption Report, which focuses on different topics and areas each year. These reports have already discussed the topic of water and water-related industries, the judiciary, and the business sector. In 2011 the main topic was climate change.
Since 2006, Transparency International Hungary has taken part in the monitoring of the implementation of the OECD Convention. TI assessed to what extent the individual states comply with the agreement approved by the member states of the Organisation for Economic Co-operation and Development on the 21st of December, 1997. This particular convention aims to battle the bribery of foreign officials.
The Group of States against Corruption was established in 1999 by the Council of Europe, with the aim to monitor its member states’ use of anti-corruption measures. In the case of Hungary, the first and second evaluation rounds were launched in 2001 and 2006, respectively. The third round was launched in June 2010, when GRECO drew up recommendations for Hungary regarding the issues of party funding and the implementation of the provisions of the Criminal Law Convention on Corruption. TI Hungary’s experts also took part in the research.