This chapter describes the procedures that were used to report results in the International Civic and Citizenship Education Study (ICCS) publications. The chapter begins with a description of the replication methodology used to estimate sampling variance and then provides an outline of how the imputation variance of the civic knowledge scores was computed. The subsequent section describes how the significance tests for differences between country and subsample means or percentages were conducted. This chapter also includes descriptions of how the multiple regression analyses were conducted and how the hierarchical models explaining civic knowledge were estimated. The final section of the chapter outlines how missing data were treated during multivariate analyses of the ICCS data.