Anatomy of an Argument

Every contention, rebuttal, and weighing claim in Public Forum comes down to three parts: claim, warrant, and impact. Once you can see those parts, you can build cases, attack them, and explain to any judge why you won.

Claim: what you want the judge to believe

The claim is the headline: "Federal high-speed rail reduces transport emissions." It is what you are asking the judge to accept. Make claims specific enough to test, because a vague claim like "the plan is good" can’t be meaningfully attacked or defended.

Warrant: why the claim is true

The warrant is the mechanism, the "because." For example: "Because rail captures car and short-haul air trips in corridors under 400 miles, shifting passengers to lower-emission transport." Rounds are won and lost on warrants, and an opponent who attacks your link is attacking your warrant. If you can’t explain why A causes B, you don’t have an argument yet.

Impact: why the judge should care

The impact turns the claim into a reason to vote: "Cutting corridor emissions improves air quality for millions and reduces climate harms." Impacts need magnitude (how big), probability (how likely), and timeframe (how soon). Without an impact, a claim is only a fact, and a fact on its own gives the judge no reason to vote.

Worked example: single-use plastics

Resolution: The United States federal government should ban single-use plastics. In the diagram below, each sentence does one job and only one. The assignment at the end of this lesson asks you to break an argument down the same way.