In this paper I introduce and analyze two different ways to explain the phenomenon of the disagreement; one is the modern philosophical tradition, and the other is related to argumentation theories. In first place, I explain what a defective explanation of the disagreement is. In second place, I make a relation between this kind of explanation and the reflections of Descartes, Locke, Hobbes, and Leibniz regarding the disagreement. In third place, I invoke the ideas of Popper and Toulmin to understand why those modern philosophers explained the disagreement in such a way. Finally, I introduce some non-defective explanations of the disagreement, related to the argumentation theories, as a different and most accurate framework to explain the disagreement.