How to Write a Debate Case (Step-by-Step)

You've got a debate topic. Your tournament is in a week. And you're staring at a blank document wondering where to start. Sound familiar?

Writing a debate case — the prepared set of arguments you'll deliver in a round — is one of the most important skills in competitive debate. A strong case won't guarantee a win, but a weak case will almost guarantee a loss. The good news is that case-writing is a skill you can learn and improve systematically. Here's how to do it, step by step.

Step 1: Understand the Resolution

Before you write a single argument, make sure you understand exactly what the resolution is asking. This sounds obvious, but it's where a surprising number of debaters go wrong.

Break the resolution into its key terms. If the resolution is "This house would ban social media for children under 16," the key terms are "ban," "social media," "children under 16." What counts as social media? Does "ban" mean the government enforces it, or that platforms self-regulate? How do you define "children under 16" — is it by account age, verified age, or something else?

Defining these terms clearly at the start of your case is called "setting the definition" or "framing." It matters because the definition shapes what arguments are and aren't relevant. If you define "social media" to include YouTube and messaging apps but your opponent defines it as only platforms with a public feed, you could end up arguing about different things — and the judge will side with whoever's definition is more reasonable.

A good definition is fair, reasonable, and debatable. Don't define the resolution so narrowly that the other side can't argue against it. Judges penalize teams that "squirrel" — define the motion in a way that avoids the intended debate.

Step 2: Brainstorm Arguments (Both Sides)

Grab a piece of paper and divide it into two columns: one for your side, one for the other side. Spend 15-20 minutes brainstorming every argument you can think of for both sides. Don't filter yet — just generate ideas.

For each argument, ask yourself three questions: What is the claim? (What am I arguing?) Why is it true? (What's the reasoning or evidence?) Why does it matter? (What's the impact on the debate?) These three elements — claim, warrant, impact — are the building blocks of every strong argument.

Brainstorming the other side's arguments is just as important as brainstorming your own. You can't prepare rebuttals for arguments you haven't considered. The best debate cases are written by people who understand the opposing case as well as they understand their own.

Step 3: Select Your Strongest Arguments

You probably brainstormed 8-12 arguments. You need 2-3 for your case. More isn't better — it's worse. A case with three deeply developed arguments beats a case with six shallow ones every time.

How to choose: pick the arguments that are hardest for the other side to refute, that have the strongest evidence behind them, and that cover different aspects of the topic (you don't want three arguments that all say the same thing in different words). Ideally, your arguments should work together to build a coherent narrative about why your side of the resolution is correct.

If you're debating with a partner (in CNDF or BP), divide the arguments between you. Each speaker should own their arguments completely — know the evidence, the reasoning, and the likely rebuttals inside and out.

Step 4: Research Your Evidence

For prepared rounds, evidence is what separates a good case from a great one. Statistics, expert opinions, real-world examples, and case studies all add credibility to your arguments. Here's how to research effectively:

Start with the big picture. Read 2-3 overview articles about your topic to understand the main arguments and counterarguments. Wikipedia is fine as a starting point, but don't cite it in your speech — use it to find the original sources cited in the article.

Find specific evidence for each argument. For each of your 2-3 main arguments, find at least one strong piece of evidence — a statistic from a credible source, a quote from a relevant expert, or a real-world example that illustrates your point. Statistics Canada, government reports, academic studies, and reputable news outlets are your best sources.

Prepare evidence against the other side's arguments. Remember those opposing arguments you brainstormed? Find evidence that counters them too. Having a statistic ready that directly contradicts your opponent's likely claim is one of the most effective moves in debate.

Organize your evidence. Create a simple document with your key evidence organized by argument. Include the source name and date for quick citation during your speech. You don't need to read full quotes — paraphrasing with a source citation ("According to a 2025 Health Canada report...") is usually more effective.

Step 5: Structure Your Case

A well-structured case follows a clear pattern that judges can easily follow. Here's the template:

Introduction (30-45 seconds). State the resolution, define key terms, and briefly preview your arguments. "Good afternoon. Today we're debating [resolution]. We define [key terms] as [definition]. We will argue that [brief preview of arguments]."

Argument 1 (2-2.5 minutes). State your first argument clearly (signpost it: "Our first argument is..."). Explain the reasoning. Present your evidence. Explain the impact — why this argument matters for the debate. Transition to your next argument.

Argument 2 (2-2.5 minutes). Same structure as Argument 1. Make sure it covers different ground — judges notice when arguments overlap.

Argument 3 (if time allows, 1.5-2 minutes). A third argument can strengthen your case, but only if you have time to develop it properly. A rushed third argument is worse than a strong two-argument case.

Conclusion (30-45 seconds). Summarize your arguments briefly and explain why, taken together, they prove your side of the resolution. End with a clear, confident closing statement.

Time the whole thing. If your speaking time is 7 minutes, your case should take about 6-6.5 minutes when practiced — leave room for POIs and natural variation in delivery.

Step 6: Prepare for Rebuttal

Your case isn't just your constructive arguments — it's also your plan for responding to the other side. This is where that brainstorm of opposing arguments pays off.

For each argument you expect the other side to make, prepare a brief response (30-60 seconds). You won't use all of them, but having them ready means you can respond confidently in real time rather than scrambling.

The best rebuttals do three things: they identify specifically what the opponent argued, they explain why that argument is wrong or insufficient, and they explain why your argument still stands despite the opponent's point. "They argued X. But this fails because Y. And even if X were true, our argument about Z still outweighs because..."

For more on how to rebut effectively and what judges are looking for, read our post on what judges look for in a debate round.

Step 7: Practice and Refine

A case that looks great on paper can fall apart when you actually deliver it. Practice your case out loud at least three times before the tournament:

First run-through: Focus on getting through the whole case within time. Identify where you're running long or short.

Second run-through: Focus on delivery — are you speaking clearly, making eye contact (or looking at the camera for online rounds), and emphasizing your strongest points?

Third run-through: Have your partner or a friend play devil's advocate — challenge your arguments and see how well you can defend them on the fly.

After each practice, revise. Cut the weak parts, strengthen the strong parts, and tighten your language. The best debate cases are rewritten multiple times before they're delivered in competition.

A Note on Impromptu Rounds

Everything above applies to prepared rounds where you know the topic in advance. For impromptu rounds (common in BP, where you get 15 minutes of prep), the process is compressed but the structure is the same. Brainstorm quickly, pick your 2-3 strongest arguments, and structure them clearly. You won't have time for deep research, so lean on general knowledge, logical reasoning, and real-world examples you're already familiar with.

The students who do best in impromptu rounds are the ones who read widely — news, history, economics, philosophy — so they have a deep well of examples to draw from on any topic.

Ready to Get Started?

Case-writing is one of the core skills we teach at DSDC. Our Junior and Senior classes include step-by-step instruction on building arguments, researching evidence, and structuring cases for CNDF, BP, and World Schools formats. Every student receives personalized feedback on their cases — not just what to improve, but how.

Book a free consultation and we'll recommend the right class for your level, or explore our classes to see what we offer.