How to prepare a strong argument for a school debate

How do you prepare an argument that can stand up to questions in a school debate? Decide what you need to show, find evidence that supports it, and explain the connection. Then test the case against a serious objection. University guidance on writing and speaking can help you organise this work. Adapt it to your debate's instructions.

State a position you can support

A topic tells the audience what you are discussing. A claim tells them what you want them to accept. The University of North Carolina at Chapel Hill's Writing Center suggests checking whether a thesis takes a position that others could challenge. Go beyond naming a subject or summarising agreed facts: say what you will argue.

Write that position in a clear sentence, and be ready to change it as you research. UNC recommends collecting and organising evidence to develop a working thesis, then adjusting it as necessary. If the evidence supports a narrower conclusion than you first intended, narrow the claim. Keep the claim within what your sources can support.

Connect claim, evidence and reasoning

Purdue University's account of the Toulmin model separates the claim, its grounds and its warrant. The grounds are the supporting facts and evidence. The warrant is the assumption linking that evidence to the claim. For debate preparation, this gives you a practical check: what am I saying, what supports it, and why does that support lead to this conclusion?

That last step needs space in the speech. UNC's guidance on evidence asks writers to explain how and why a source supports their argument. Apply the same principle aloud: after a finding, quotation or example, explain how it supports your point. Check both whether a source is credible and whether it supports the conclusion you want the audience to draw.

Evidence can take forms besides statistics. Personal experience may be relevant to the topic and audience, but UNC cautions against making it the only evidence in most papers. In a debate, use an experience to illustrate a point, and look for wider evidence to show how common it is. Check that each piece of evidence supports what you say it does.

Check the source behind the finding

Cornell University's guidance on evaluating sources begins with questions about authorship and publication. Find out who produced the material, check their reputation and affiliations, and consider whether the publication date fits your question. An older source may still be suitable, depending on what you need to show.

Then examine the support behind the source's conclusion. Cornell asks whether its references can be located, whether they are credible, and whether important perspectives are missing. Follow a reported finding back to the cited study or document. Check what it actually supports before adding it to your notes. Apply the same judgement to sources with a university address or a long reference list.

Keep quotation and explanation separate

Purdue distinguishes direct quotation, paraphrase and summary. A quotation must reproduce the original wording exactly and credit its author. A paraphrase uses your own words, but still needs attribution, as does a summary. In your preparation notes, keep copied wording separate from your explanation. This helps you distinguish the author's exact words from your own.

Prepare the spoken attribution too. George Mason University's Communication Center advises speakers to identify the author or organisation, explain its credibility, and give the source type and publication date; its checklist also includes the title. Keep these details beside each finding so listeners can identify the work. Adapt this speaking guidance to your debate's rules.

Give the other side a fair hearing

As you build the case, consider how someone who disagrees would answer each point and your overall position. UNC advises presenting opposing arguments charitably. For preparation, choose a serious objection and state it fairly before writing your answer. Test your case against a strong version of the opposing argument.

Your response can take different forms. You may explain why the objection does not undermine the claim, accept a valid part while defending the main position, or revise the argument. UNC explicitly advises revision when considering a counterargument changes your position. When you acknowledge a limitation, decide which parts of your argument the evidence still supports.

Read research with its limits intact

Research on evaluating sources illustrates why those limits matter. In a 2021 study published in Harvard Kennedy School Misinformation Review, Joel Breakstone and colleagues examined 87 undergraduates who completed four online modules in a nutrition course. Students improved on source-evaluation assessments and used lateral reading more often after instruction.

Read that finding within the study's limits. The researchers compared performance before and after instruction without an untreated control group, so they could not prove cause. They examined source evaluation, not school-debate performance, and did not establish lasting improvement. Keep those limits clear when using the finding in an argument.

A 2021 case study by Elizabeth Walsh-Moorman and Kristine Pytash, published in the Journal of Media Literacy Education, examined three high-school seniors evaluating digital sources. Lateral reading encouraged scepticism and slower review, but the students still lacked sophisticated online reading and research strategies. The study is too small to establish a general effect. Its practical lesson is that students may need help applying source-checking strategies well.

Make the case fit the speaking time

The University of Portsmouth's presentation guidance recommends a manageable set of points explored in depth and arranged logically. Use the organiser's brief and actual speaking limit to decide what your case can cover. Choose points you have time to explain, with room for the evidence and an answer to an objection.

Portsmouth also recommends rehearsing aloud, timing the delivery, and recording and reviewing it to spot habits and areas for improvement. Include source attributions in the rehearsal. Listen for places where you mention a finding but leave its connection to the claim unexplained. Use these presentation recommendations to guide your debate preparation.

What to do before your next debate

Review the speech as an argument: a position you can defend, evidence you have checked, reasoning that makes the connection clear, and a fair response to the other side. Revise any claim that goes beyond its evidence. Then rehearse the whole case within the time available, including the source details your audience needs to hear.

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