Full edition for scientific use. EUYOUPART (Political Participation of Young People in Europe 2003-2005) was funded under the 5th framework programme of the European Commission and is a transnational project. The aim of EUYOUPART was to develop a high-quality instrument for the comparative measurement of political participation of young people in Europe. The project was conducted by a research team of eight participating countries (Germany, Estonia, Finland, France, Italy, Austria, Slovakia and Great Britain) and managed by SORA as scientific and administrative coordinator. The challenge for the research team was to achieve a high level of comparability of the data despite the different political cultures and methods of participating, the different research cultures and the problem of translating the different concepts into the eight languages and cultures. The instrument is a model questionnaire based on the strengths and weaknesses of the previous empirical research in the field of youth and politics. The high level of comparability of the data allows for a realistic picture of the political participation of young people in all eight participating countries, which may serve as a basis for the development of a consistent European youth policy.