The article, which is the result of a study, proposes strategies for suitable educational interaction between students and teachers, based on an analysis of a virtual university forum. The forum is one of group, discussion-based, thematic, asynchronous and argumentative communication intended to generate a knowledge-building process.The conceptual and methodological framework of the study is centered on the elements of specialized educational discourse, such as linguistic analysis of computer-mediated interaction, cyber pragmatics, the theory of courtesy, argument and the cooperative principle in communication.As a general conclusion, it is possible to say that training students and teachers in strategies for argument, linguistic correction and interaction, from a linguistic-textual and cyber pragmatic perspective, is essential to the development of collaborative, communicative and scientific competence in virtual higher education.