Authenticity is one of the most rampant buzzwords in ELT (English Language Teaching). Many have weighed in on what authenticity should mean and on how it may be achieved. The book at hand is an extensive analysis of authenticity as a term and as a concept within the academic field of ELT. The research data comprises virtually all definitions and conceptualizations of authenticity in the international ELT literature. However, only a limited number of texts contributes to what can be called an explicit negotiation of authenticity. A discourse analytical approach is taken to disentangle the hubbub of commentaries and to eventually extrapolate from it six distinct concepts which are attached to the term "authenticity". Michel Foucault's seminal theories are invoked, affording additional insights into discourse dynamics and power structures among individuals and institutions in ELT.