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The rise of English-medium education has led to considerable academic interest in communicative practices in multilingual university settings. However, there is still little research into disciplinary knowledge construction in higher education contexts where English is the academic lingua franca. To address this gap, we embrace the central role of explaining in education by proposing Exploratory Interactive Explaining (EXINTEX) as an analytical tool, which identifies the elements of explanatory episodes in the joint development of disciplinary knowledge. We then apply this tool at the micro-level of interaction to two comparable contexts differentiated primarily by the presence or absence of a teacher. Our findings confirm the relevance and high level of educational success of EXINTEX episodes in both quantitative and qualitative terms. They further reveal the dynamic interplay of epistemic authority and engagement in the learning process. Additionally, they show how research into educational disciplinary discourse and English as a lingua franca in academic settings can complement and supplement each other.

At a time of increasing internationalization in tertiary education, English-Medium Education in Multilingual University Settings (EMEMUS) has become a common practice. While there is already ample research describing this phenomenon at a local level (Smit and Dafouz 2012a), the theoretical side needs to be elaborated. This article thus aims to develop a conceptual framework that considers the dynamic nature of EMEMUS. Drawing on recent sociolinguistic orientations and discursive approaches (e.g. Scollon and Scollon 2004; Shohamy 2006; Blommaert 2010; Hult 2010), our framework regards EMEMUS as a social phenomenon and views discourse as the access point to six relevant dimensions. These dimensions are considered as inherently complex, contextually bound, and intersecting dynamically with one another. Focusing on an example from a higher education institution, the article argues for the utility of the proposed framework.