This volume centres on the domain in materials research that is the least investigated: how language teachers and learners use materials. Issues such as how the use of materials by teachers and learners inform materials writers, whether and how teachers' perspectives influence how they perceive and enact materials, and what are the factors that contribute to teachers' use of both traditional and innovative textbooks are discussed here. The volume also addresses some of the theoretical frameworks that inform materials use, and will advance the readers' understanding of this promising area of materials research. It will appeal to postgraduate students, teachers, materials developers, and researchers.