EUDO Citizenship Implementation Indicators measure on a 0 to 1 scale the formal aspects of naturalisation procedures: promotion activities, documentation requirements, administrative discretion, bureaucratic procedures, and review and appeal options. CITIMP indicators allow for comparisons of the specific steps in the procedure across countries. CITIMP indicators have been calculated for 35 European states, as well as for three German federal provinces. CITIMP indicators are an output of the research project 'Access to Citizenship and its Impact on Immigrant Integration (ACIT). = The project was financially supported by the European Fund for the Integration of Third Country Nationals, administered by DG Home Affairs. CITIMP indicators were computed on the grounds of self-collected information: questionnaires on implementation of citizenship policies were filled out by country experts.