The PIRLS 2011 international database includes data for all questionnaires administered as part of the PIRLS 2011 assessment. This supplement contains the international version of the PIRLS 2011 background questionnaires and curriculum questionnaires in the following 5 sections: (1) Student Questionnaire; (2) Home Questionnaire (Learning to Read Survey); (3) Teacher Questionnaire; (4) School Questionnaire; and (5) Curriculum Questionnaire. Each section contains a table that lists detailed information for each question, followed by the international version of the questionnaire with variable names labeled in the margin. [For the "PIRLS 2011 User Guide for the International Database," see ED544357. For Supplement 2, see ED544360. For Supplement 3, see ED544361. For Supplement 4, see ED544358.]