Which works make up Aristotle’s Organon?

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Marble bust of Aristotle with a beard and draped robe, showing detailed facial features and wavy hair, set against a dark background. — Aristotle Aristotle, detail of a Roman copy (2nd century bce) of a Greek alabaster portrait bust (c. 325 bce); in the Museo Nazionale Romano, Rome.

Aristotle’s logical writings are collectively known as the Organon, a term meaning "tool," as he viewed logic not as a theoretical science but as a tool used by all sciences. The Organon consists of the following six works:1

Categories: Discusses 10 basic kinds of entities, including substance, quantity, and quality.1
De interpretatione (On Interpretation): Covers semantics and the structure of basic propositions.1
Prior Analytics: Contains the theory of syllogistic reasoning.1
Posterior Analytics: Presents Aristotle’s theory of scientific demonstration and methodology.1
Topics: A study of nondemonstrative reasoning and the conduct of arguments.1
Sophistic Refutations: A discussion of various fallacies, originally intended as a continuation of the Topics.1

While these works are traditionally grouped together, they were not written in this chronological order. Through these texts, Aristotle established a rigorous system of rules for reasoning, marking the beginning of the systematic study of logic.1