 The rule concerning irrelevant propositions is generally accepted by all medieval authors writing on obligations, but in importantly different exact versions. We will come back to some of these versions in the following, but first we must make clear about Burley’s version. He puts special attention to the following question: a proposition is relevant if it follows or is incompatible, but follows from exactly what, or is incompatible with exactly what? As Burley sees it, this relevance must be determined on the basis of all answers that have been given in the disputation so far. On the first step immediately after the positio, relevance is based on following from the positum, or being incompatible with it. But suppose the respondent must evaluate some salient irrelevant proposition on the first step. Then this answer must be taken into account in determining whether a later proposition follows or is incompatible in the disputation. That is, the respondent must take care not only that he does not deny his positum but that all his answers remain consistent as a set.