From the skills needed to adjust for the current mismatch between labor market demands and higher education training, collaboration and the development of communication strategies stand out. To improve communication as a whole, "The Common European Framework of Reference for Languages (CEFR)," constitutes a body of reference which adds to the traditional skills new descriptors such as mediation and online interaction. The study constitutes a step towards the identification and design of online training to develop foreign languages mediation competences through virtual environments; that is, the reconstruction of meaning through online production, reception, culture and interaction practices. The contextualization for doing so is a unique one that is relevant to intercultural competences: critical incidents, which will form the basis of the contextualization of learning activities for the proposal. The learning proposal, resulting in the active involvement of students after previous phases of practical experimentation in virtual environments, and the set of parameters guiding the design constitute the main implications of the study. [For the complete proceedings, see ED608557.]