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This article presents a model of teletandem, i.e. tandem through desktop videoconferencing (Telles 2009). The aim of such a model is twofold: heuristic and pedagogical. It is heuristic because it enables us to understand teletandem at all its levels and partially to predict (in probabilistic terms) what can happen in a teletandem environment. It is also pedagogical because it helps us formulate plans of action to improve future use and environment design. To build this model, we have drawn upondoi:10.1590/0102-4450430446379623426 fatcat:fal2jgs2qzfiri44yie23xa46y