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The observability of argumentation in a discursive/conversational analytic approach is questioned. After introducing the corpus, which encapsulates argumentation at a high argumentative probability, Plantin’s “dialogic model of argumentation” is briefly discussed. In this model, there are “argumentative situations”: speakers build antagonist positions (proposition and opposition) as answers to the same question. First, the value of the model is tested on a prototypical example. Second, the notion of opposition is specifically analyzed—an opportunity to tackle the linguistic and discursive resources of the opposition and to consider the likely targets of the opposition. The conclusion introduces a method—still in an experimental stage—for mapping argumentation situations.