The order of the books (or the teachings from which they are composed) is not certain, but this list was derived from analysis of Aristotle's writings. It goes from the basics, the analysis of simple terms in the "Categories," the analysis of propositions and their elementary relations in "On Interpretation", to the study of more complex forms, namely, syllogisms (in the "Analytics") and dialectics (in the "Topics" and "Sophistical Refutations"). The first three treatises form the core of the logical theory "stricto sensu": the grammar of the language of logic and the correct rules of reasoning. The "Rhetoric" is not conventionally included, but it states that it relies on the "Topics".