Thinking books · Logic & argumentation · Stephen Toulmin, 1958

The Uses of Argument — the big ideas

A philosopher’s case that formal logic is the wrong model for real-world argument, and a better model.

Free — no account needed to read

The big ideas

Real arguments have six parts, not two: claim, grounds, warrant, backing, qualifier and rebuttal. The warrant — why those grounds support that claim — is normally unstated and normally where it fails.

Qualifiers matter: "usually" and "always" are different claims, and collapsing them is a common way arguments overreach.

Arguments are field-dependent — what counts as adequate support in law, medicine and engineering genuinely differs — so importing standards across fields causes confusion.

Practise it — no need to have read it

Take a claim you rely on at work and write all six parts, especially the unstated warrant and the rebuttal conditions.

A hint: Most people have never written a rebuttal condition for a claim they act on daily.

Where it shows up in real life

• Strategy documents
• Technical decisions
• Any recommendation you have to defend

Described in our own words with the source named — never quoted, and not a substitute for reading the book.