This book aims to contribute to the discipline of teaching English as an international language by exploring teachers’ reflections on the recent changes within the English language for their teaching profession. It presents a comprehensive and thorough examination of the place of English as an international language in English language teaching, especially in an Asia-Pacific context, looking at Vietnam and countries in which the context of ELT is similar. It examines and revisits the relevance of teaching implications, teaching of cultures and teaching materials currently employed in an EFL context. The author investigates a range of critical issues in teaching English in today’s EFL context as well as challenges in implementing new teaching ideas to meet learners’ demands to communicate with speakers from various backgrounds. Finally, the book presents a number of research-informed implications for pedagogy, theory and research in teaching EIL in ELT.