The course began by distinguishing conception from judgment, then clarified expressions, universals, predicables, and definitions. It proceeded to propositions, modalities, contradiction, and conversion.
The syllogistic figures, induction, analogy, and reductio clarified forms of reasoning. The five arts distinguished demonstration, dialectic, rhetoric, poetry, and sophistry, while the fallacies showed how reasoning fails.
The conclusion brings these strands into one organized intellectual discipline through subject, principles, problems, and introductory headings. Its enduring value lies in applying these distinctions carefully when studying other sciences.