 The above three basic rules are not sufficient, as they cover only what follows from the positum alone or is incompatible with it alone. An important part of the obligational technique is to understand all propositions put forward in an obligational disputation as either relevant (pertinens) or irrelevant (impertinens). A proposition that follows or is incompatible, is relevant, and others are irrelevant. Relevant propositions are to be answered according to their logical status, or in other words according to rules 2. and 3. On how to answer irrelevant propositions, Burley gives the following rule: