 Like Campsall, Ockham has nothing to add to the theory of assertoric syllogisms, which was by then well understood. Let us, however, have a look at the proof method using the expository syllogism that medieval logicians such as Ockham seem to have preferred over Aristotle’s cumbersome method of ekthesis. Ockham uses this method frequently, though not as frequently as Buridan later did.