Skip to main content

Toulmin Argument

OWL logo

Welcome to the Purdue OWL

This page is brought to you by the OWL at Purdue University. When printing this page, you must include the entire legal notice.

Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

What is the Toulmin Method?

Developed by philosopher Stephen E. Toulmin, the Toulmin method is a style of argumentation that breaks arguments down into six component parts: claim, grounds, warrant, qualifier, rebuttal, and backing. In Toulmin’s method, every argument begins with three fundamental parts: the claim, the grounds, and the warrant.

claim is the assertion that authors would like to prove to their audience. It is, in other words, the main argument.

The grounds of an argument are the evidence and facts that help support the claim.

Finally, the warrant, which is either implied or stated explicitly, is the assumption that links the grounds to the claim.

This image shows a generic diagram of a Toulmin argument with the claim and grounds linked by a warrant.

For example, if you argue that there are dogs nearby:

This image shows a diagram of a Toulmin argument (

In this example, in order to assert the claim that a dog is nearby, we provide evidence and specific facts—or the grounds—by acknowledging that we hear barking and howling. Since we know that dogs bark and howl (i.e., since we have a warrant) we can assume that a dog is nearby. 

Now, let’s try a more academic approach. Let’s say that you are writing a paper on how more research needs to be done on the way that computer-mediated communication influences online and offline relationships (a paper, in other words, very much like the OWL's APA Sample paper).

This image shows a diagram of an academic Toulmin argument with the grounds and claim linked by a warrant (that when a paper lacks a broad enough perspective, more research would be beneficial to prove its claims).

In this case, to assert the claim that additional research needs to be made on how online communication affects relationships, the author shows how the original article needs to account for technological, demographic, and modality limitations in the study.  Since we know that when a study lacks a perspective, it would be beneficial to do more research (i.e., we have a warrant), it would be safe to assume that more research should be conducted (i.e. the claim).

The other three elements—backing, qualifier, and rebuttal—are not fundamental to a Toulmin argument, but may be added as necessary. Using these elements wisely can help writers construct full, nuanced arguments.

Backing refers to any additional support of the warrant. In many cases, the warrant is implied, and therefore the backing provides support for the warrant by giving a specific example that justifies the warrant.

The qualifier shows that a claim may not be true in all circumstances. Words like “presumably,” “some,” and “many” help your audience understand that you know there are instances where your claim may not be correct. 

The rebuttal is an acknowledgement of another valid view of the situation. 

Including a qualifier or a rebuttal in an argument helps build your ethos, or credibility. When you acknowledge that your view isn’t always true or when you provide multiple views of a situation, you build an image of a careful, unbiased thinker, rather than of someone blindly pushing for a single interpretation of the situation.

For example:

This image shows a diagram of the earlier argument about hearing dogs nearby, with a qualifier, backing, and rebuttal added.

We can also add these components to our academic paper example:

This image shows a diagram of the earlier academic argument about online relationships, with a qualifier, backing, and rebuttal added.

Note that, in addition to Stephen Toulmin’s Uses of Argument, students and instructors may find it useful to consult the article “Using Toulmin’s Model of Argumentation” by Joan Karbach for more information.