of each study, involving some 250 country experts, are based on a multi-stage survey and review process. The aim of the procedure is to arrive at results that are as objective and comparable as possible. Two experts per country - usually one international and one local expert - prepare and review qualitative country analyses on the basis of 49 standardized questions and translate the answers independently of each other into quantitative assessments. On this basis, seven regional coordinators standardise the results intra- and interregionally. A scientific advisory board of transformation experts monitors and discusses the results and adopts the final values. The prototype of the BTI was published in 2003 and subsequently methodologically revised. Since then, no fundamental methodological changes have taken place, so that comparable time series since 2006 can be formed. Publications The study results are published in the form of country and regional reports and a book series in English and partly in German. Initiated and financed by foreign think tanks, BTI study content has also been published in other languages: in Arabic by the Gulf Research Center in 2009, in Russian by the Moscow Center for Post-Industrial Studies in 2010 and in Spanish by the Argentinean Centro para la Apertura y el Desarrollo de América Latina in 2014. The BTI Atlas, a graphics application, offers individual visual access to the results and reports of all editions since 2006. Use The Bertelsmann Transformation Index is used both by governments around the world to assess partner countries and by international organizations to produce their own analyses. Transparency International's Corruption Perceptions Index and the Ibrahim Index of African Governance are based in part on BTI results. The sister project Sustainable Governance Indicators, which is methodologically modelled on the BTI, examines the reform capacity and sustainability of advanced democracies and market economies. The study covers all OECD and EU member states, including the OECD core countries not included in the BTI. References External links Website Sustainability metrics and indices Environmental policy Social change