  Zabarella followed Averroes in dividing logic into two parts: universal logic, which is common to all subjects; and particular logic, which is specific to particular subjects. The first three books of Aristotle’s Organon, the Categories, On Interpretation and the Prior Analytics constitute the universal part of logic. Aristotle’s Posterior Analytics, Topics and Sophistical Refutations are said to deal with particular logic as much as they deal respectively with the demonstrative syllogism, the dialectical syllogism and the sophistical syllogism.  Following the Neoplatonic commentators (above all Simplicius), Zabarella also included Aristotle’s Rhetoric and Poetics within logic. The former is included because it teaches the use of the rhetorical syllogism or enthymeme, and rhetorical induction or example; the latter because it also teaches the use of example, not to persuasive ends, but for imitation.