This book is a guide to understanding and applying the essential, heretofore elusive, notion of context in language study and pedagogy. Éva Illés offers a new, critical, systematic theoretical framework, then applies that framework to practical interactions and issues in communicative language teaching rooted in English as a Lingua Franca. By linking theory and practice for research and teaching around the world, this book brings a new awareness of how context can be conceptualised and related to language pedagogy to advanced students, teachers, teacher educators and researchers of language teaching, applied linguistics and pragmatics.