What Is an Argument? Premises, Inferences & Conclusions

Direct Answer

In logic and critical thinking, an argument is not a quarrel. It is a structured unit of reasoning: a set of premises — statements offered as reasons — together with a conclusion they are meant to support. The connection between them is the inference, the reasoning step that takes you from "these things are so" to "therefore this is so."

The key contrast is with a mere assertion: "The economy will recover" is a claim but not an argument. "Inflation is falling, unemployment is low, and consumer confidence is rising; therefore the economy will recover" is an argument — it supplies reasons. Arguments are the currency of rational persuasion: to argue is to invite evaluation of your reasons, which is exactly what the Socratic tradition prized and what critical thinking trains.

Arguments come in three main kinds. Deductive arguments aim to make the conclusion follow necessarily from the premises: if the premises are true, the conclusion must be true. Inductive arguments generalize from samples: the premises make the conclusion probable. Abductive arguments infer the best explanation of the evidence. Each kind has its own standard of success.

Historical Context

The systematic study of arguments begins with Aristotle, whose Topics and Rhetoric analyzed the dialectical and rhetorical uses of argument, and whose Prior Analytics founded formal logic on the syllogism — the first precise account of when an argument's conclusion follows from its premises. Aristotle distinguished demonstration (argument from true premises) from dialectic (argument from accepted opinions) and catalogued the ways arguments fail, in the Sophistical Refutations.

In the twentieth century, argumentation theory emerged as a distinct field. Stephen Toulmin's The Uses of Argument (1958) modeled arguments as claims, grounds, warrants, backing, qualifiers, and rebuttals, freeing the study of argument from the syllogism. Douglas Walton and the informal logic movement developed argument schemes and critical questions, showing how everyday arguments in law, politics, and science can be evaluated rigorously without formalization. Today the study of argument spans logic, rhetoric, cognitive science, and AI — where argument mining and automated reasoning continue the ancient project.

Philosophical Significance

Arguments raise the central questions of epistemology and the philosophy of logic. What makes an argument good? The classical answer has two parts: the inference must be good (the premises must genuinely support the conclusion) and the premises must be true. Formal logic formalizes the first part as validity; the second part is the business of inquiry. The relation between the two is the subject of the theory of logical consequence.

Arguments also embody a normative ideal: that belief should follow reasons rather than force, tradition, or emotion. This ideal underwrites democracy, science, and law — institutions that exist to arbitrate claims by argument rather than power. John Dewey and the pragmatists treated argument as the method of social inquiry; Wittgenstein and the philosophy of language tradition probed how arguments work in ordinary language. The philosophical significance of argument is thus double: it is the instrument of knowledge, and it is the form of a rational community.

Examples

Deductive (valid form):

• All planets orbit a star. (premise)
• Mars is a planet. (premise)
• Therefore, Mars orbits a star. (conclusion)

Inductive (probabilistic):

• Every swan observed in Europe, Asia, and Africa has been white. (premises)
• Therefore, all swans are white. (conclusion — famously falsified by Australian black swans)

Abductive (best explanation):

• The driveway is wet and there are puddles on the patio. (premises)
• Therefore, it rained last night. (conclusion — a hypothesis, not a certainty)

Non-argument (assertion with no reasons):

• "You should buy this stock." — a claim without premises.

Related Concepts

Arguments are the subject matter of logic, and their evaluation is the core skill of critical thinking. A deductive argument can be assessed for validity and soundness; an inductive one for strength; an abductive one for explanatory power. Arguments fail through logical fallacies, and their canonical ancient form is the syllogism.

Further Learning

The Stanford Encyclopedia of Philosophy entry "Argument and Argumentation" and the Internet Encyclopedia of Philosophy entry "Critical Thinking" are excellent overviews. Stephen Toulmin's The Uses of Argument and Douglas Walton's Argumentation Theory: A Very Short Introduction give the modern frameworks. For the formal side, work through any standard logic text — Patrick Hurley's A Concise Introduction to Logic is a classic, with extensive exercises in argument identification and evaluation.