This supplement contains documentation on all the derived variables contained in the International Civic and Citizenship Education Study (ICCS) 2009 data files that are based on survey variables. These variables were used to report data in the ICCS 2009 international reports, and are made available as part of the ICCS 2009 International Database to be used in secondary analyses. This supplement has seven sections corresponding to each survey instrument from which reporting variables are derived: (1) School Questionnaire; (2) Teacher Questionnaire; (3) Student Achievement Booklets; (4) Student Questionnaire; (5) European Module Questionnaire; (6) Latin American Module Questionnaire; and (7) Asian Module Questionnaire. Each section lists first the indices and then the scales derived from survey variables in the order of the variables that were used to derive the variable as they appear in the instruments. The following information is provided for each derived variable: (1) Variable Name: The name of the derived variable; (2) Description: A description of the variable content; (3) Procedure: A procedural description of how the derived variable was computed; and (4) Source: Source variables used to derive scale or index. [For the "ICCS 2009 Technical Report," see ED544622.]