Calls for teaching and learning that cross subject boundaries have been making themselves heard in recent Higher Education literature in different national contexts. Communication is pivotal in any such learning encounter: it is in the process of negotiating meaning across disciplines that its rewards and challenges lie. And yet, the question of what characterises interdisciplinary classroom communication in the sector is little researched and little understood. How such interaction differs from that in the monodisciplinary university classroom is under-theorised. Adapting Applied Linguistic theory in Intercultural Communicative Competence (Byram, M. (1997). Teaching and assessing intercultural communicative competence. Clevedon: Multilingual Matters.) and drawing on a taxonomy of academic disciplines (Becher, T., & Trowler, P. R (2001). Academic tribes and territories.Buckingham: Society for Research in Higher Education/Open University Press.), the article proposes a model of Communicative Competence as a conceptual tool to shape thinking in developing and researching interdisciplinary teaching and learning in the university classroom.socialisation into a discipline subtly shapes ways of thinking and orientations to learning and that this can ultimately lead to mutual incomprehension when specialists from different subject domains try to collaborate. Advocates of interdisciplinary learning in HE make persuasive arguments for the provision of formal opportunities for learning that crosses subject boundaries in university curricula These arguments include: (i) the educational benefits of engaging critically with one's own discipline by viewing its limitations from another perspective, (ii) the fact that modern working patterns increasingly call for multi-professional team work, and (iii) that the pressing world challenges that confront us daily in the media (pandemics, water politics, global warming, famine, migration, international crime, etc.) require new, holistic approaches. Such advocates highlight the value of interdisciplinary learning as a way of assisting HE Institutions in preparing future graduates who have the ability to tackle such complex problems wisely.The conception of interdisciplinarity envisaged in this article is one that fits well with such aspirations and is one that involves collaborations between students from differing subject areas in pooling their disciplinary knowledge in addressing complex and significant, real world problems. The ability to understand and be understood by a diverse group of specialists is essential to such endeavours and, by implication, the form of interdisciplinarity under discussion is all about communication. Experience of this type of collaborative problem-solving would seem intuitively to hold potential for developing students' abilities in effective interdisciplinary interaction after graduation. But what does effective interdisciplinary interaction mean in practice?Research on interdisciplinarity in HE appears to be largely silent on the matter of what the pa...