A growing number of European Transparency International (TI) chapters conduct regular transparency assessments of the cities at national level. They often serve as a useful tool in motivating and persuading institutions to make their decision-making more visible to public and more open to public participation, while, at the same time, enhancing accountability of elected officials. The idea was to create the pilot comparison of transparency of European capital cities using a limited number of indicators. The overall aim was also to strengthen cooperation among European TI chapters by comparing European capital cities in order to better understand differences between countries, recognise best practices, and ultimately to improve citizens’ access to information and decision-making.