A warrant is the reasoning that connects evidence to a claim — the logical bridge that explains why the evidence supports the claim. Stephen Toulmin introduced the term in The Uses of Argument (1958) to name the often-unstated assumption that makes an argument work.
Consider: “This policy has failed (claim), because unemployment has risen 3% since it was enacted (evidence).” The warrant — unstated — is that a policy’s success should be measured by employment numbers. If the reader shares that assumption, the argument works. If the reader believes the policy should be measured by other criteria (inflation, GDP, poverty rates), the argument fails — not because the evidence is wrong but because the warrant is contested.
Many essay arguments break down at the warrant level. The writer presents strong evidence for a claim, but the connection between evidence and claim relies on an assumption the reader doesn’t share. Making warrants explicit — “I’m measuring this policy’s success by its effect on employment, because…” — is one of the most powerful moves in argumentative writing. It transforms a hidden assumption into a claim that can be examined, supported, or challenged.
Warrants are also the point where disciplinary differences surface. In a literary essay, the warrant might be “close reading of textual detail reveals authorial intention.” In a social science essay, it might be “correlation in controlled studies suggests causation.” Each field’s warrants are part of what makes it a field — and a writer working across fields needs to make the warrants explicit rather than assuming they’re shared.
Related terms
- claim — what the warrant supports
- evidence — what the warrant connects to the claim
- argument — the structure that warrants hold together
- counterargument — often targets the warrant rather than the evidence