In this chapter, we describe the development of the international questionnaires for students, teachers, school principals, information and communication technology (ICT) coordinators, and national research centers. The student questionnaire was designed to gather information about students’ personal and home background as well as use of and familiarity with computers and computing. It included questions relating to students’ background characteristics, their experience and use of computers and ICT to complete a range of different tasks in school and out of school, and their attitudes toward the use of computers and ICT. The teacher questionnaire was designed to gather teachers’ perspectives on the general school environment for ICT use, their familiarity with using ICT, their attitudes regarding the use of ICT in teaching, and their use of ICT for teaching and learning in a reference class.