The Toulmin method is an informal method of reasoning. Created by the British philosopher Stephen Toulmin, it involves the grounds (data), claim, and warrant of an argument. The Toulmin method suggests that these three parts are all necessary to support a good argument. The grounds are the evidence used to prove a claim. The warrant is the assumption or principle that connects the grounds to the claim. All three parts are critical to achieving rhetorical analysis. The Toulmin method is an informal method of reasoning. Created by the British philosopher Stephen Toulmin, it involves the grounds (data), claim, and warrant of an argument. The Toulmin method suggests that these three parts are all necessary to support a good argument. The grounds are the evidence used to prove a claim. The warrant is the assumption or principle that connects the grounds to the claim. All three parts are critical to achieving rhetorical analysis.