‘Perhaps not since the shift in the mid-20th century from education for the elite to education for the masses has there been an impact of this kind on the learning experiences of young people’ (p. 1). If Macaro is even half right with this bold claim about the introduction and expansion of English as a Medium of Instruction (EMI), then this global phenomenon must surely be of major significance to the ELT community. This book, with its firm foundations in educational research, applied linguistics, second language acquisition (SLA), and English language teaching, is for me the most comprehensive and coherent overview of this complex subject to date. This complexity starts with the definition of EMI, which Macaro...