The International Civic and Citizenship Education Study (ICCS) studied the ways in which young people are prepared to undertake their roles as citizens. ICCS was based on the premise that preparing students for citizenship roles involves developing relevant knowledge and understanding as well as helping them form positive attitudes toward being a citizen and participating in activities related to civic and citizenship education. It also examined differences among countries in relation to these outcomes of civic and citizenship education, and it explored how differences among countries relate to student characteristics, school and community contexts, and national characteristics. This technical report provides information about the data and analytic procedures that have been used in the study.