This book is the first to offer a conceptual framework of English-medium education that can be used across different international higher education (HE) contexts. It provides readers with an understanding of the complexities, possibilities and challenges that this phenomenon raises in the 21st century. Making the case for the pressing need for an overarching conceptualisation, the authors discuss, from a theoretical point of view, the recently introduced ROAD-MAPPING framework for 'English Medium Education in Multilingual University Settings' (EMEMUS). Drawing on current research and examples from a variety of settings, the book makes a strong case for the applicability of the framework in two important directions: as a methodological tool for researching educational practices and as an analytical guide to examine policies and teacher education programmes.