Claim, evidence, warrant

Good intentions don't help a reader understand; the skill that does is argument — a falsifiable claim, evidence they'll credit, and the warrant that links the two.

Tended July 2026 · 2 min read

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Before he taught writing, William trained with a Buddhist monk who defined love as the ability to help someone suffer less — and leaned hard on that word, ability. You can see that a reader is stuck, and you can want to help, but without the ability you may do harm. Writing is the same: intending to help a reader understand isn't enough. The skill that gives you the ability is argument, and every argument has three parts.

How it works

A claim is a falsifiable statement — one someone could doubt. "Water is wet" isn't a claim, because nobody disputes it; "water beats Gatorade for hydration" is. Evidence is what earns the claim, because readers won't take it on your say-so — and the trick is that credibility is reader-relative: some communities want a citation from an authority, others are convinced by a well-chosen anecdote, so you supply the kind of evidence these readers accept. A warrant is the logical bridge from the evidence to the claim, because evidence never speaks for itself: two writers can read the same data and reach opposite conclusions, so you make the connection explicit. Claim, evidence, warrant — put all three on the page and you can actually move a reader's understanding, not just wish you could.

Why it matters

Most writing that fails to convince isn't missing sincerity; it's missing one of the three parts. A claim with no evidence is an assertion; evidence with no warrant is a pile of facts the reader connects however they like (often not your way); a warrant with no falsifiable claim is a bridge to nowhere. Naming the three lets you diagnose exactly which one you dropped — and it reframes persuasion as a skill you can build, not a gift you either have or don't.

Try it

State your claim as something a reasonable reader could doubt; if no one could dispute it, it isn't a claim.
Choose evidence these readers will credit — authority, data, or anecdote — not just what convinces you.
Make the warrant explicit: say, in a sentence, why this evidence supports this claim.

Common pitfalls

Leaving the warrant implicit because it's obvious to you — it rarely is to the reader, and an unstated bridge is where sound arguments quietly collapse. The other failure is evidence chosen for its strength in the abstract rather than its credibility to the specific community you're writing for.

A warrant is more like a logical bridge, connecting your evidence to your claim.

WILLIAM · I WISH I KNEW THIS BEFORE I STARTED WRITING · 2025

Intention doesn't help a reader understand. A claim, its evidence, and the warrant between them do.

Drawn from

William, I Wish I Knew This Before I Started Writing Online (Writer Science, 2025).
The claim–evidence–warrant model of argument (Stephen Toulmin).
Related: You're in the persuasion business, Name the logical relationship, Use the error method, not the gap method.

In this collection

Collection overview Provoke in the title, orient in the subtitle The writer's draft vs. the reader's draft Point the passion outward Sell the problem, not the topic A problem is a condition and a cost Know your reader, not just your audience Write for the reader's working memory Learn your reader's code words Writing is a two-player game You're in the persuasion business Make a promise the wrong reader can refuse Pick a villain Change the reader, don't express yourself Signal value with the language of instability Use the error method, not the gap method Claim, evidence, warrant Beat readers to their objections Concede before you dismantle