This book is an exploration of the desirability and feasibility of English Medium Instruction (EMI) in specific university settings in South East Asia. There is an increasing trend in many universities in Asia, as elsewhere in the world, to introduce ‘international’ academic programmes taught through the medium of English. Despite the rapidity of this development, there is a dearth of empirical research that investigates the opportunities and challenges across a range of specific contexts. This volume intends to occupy this research space, firstly by reviewing historical and contemporary trends and changes to EMI, and by eliciting the perceptions of a number of applied linguists in a range of Asian universities. These introductory chapters are followed by three case studies exploring the beliefs and practices of EMI lecturers in Malaysia, Brunei and Indonesia, and a survey of Malaysian students’ attitudes to key issues relating to medium of instruction. Based on these empirical studies, implications will be drawn with regard to policy, curricula, pedagogical practice, professional development and further research. This book will provide guidance for decision-makers and practitioners for the effective planning and implementation of EMI programmes where English is an additional language for lecturers and students.