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How to Debate: A Step-by-Step Guide for Beginners

To debate well, define the question, build two or three reasons with evidence, listen to what the other side actually says, and answer that. This guide gives the full sequence, from reading the motion to closing, with a timed practice plan and the mistakes beginners make most.

Updated 2026-11-04

The short version: seven steps

Every format adds its own rules, but the core sequence is the same whether you are in a school round, a university competition or an online room.

  1. Read the motion twice and rewrite it in your own words.
  2. Define the key terms and what the debate is and is not about.
  3. Choose two or three reasons that support your side.
  4. Back each reason with an explanation and evidence.
  5. Predict the other side’s best two arguments and prepare answers.
  6. During the round, listen, take notes and rebut the points that matter most.
  7. Close by comparing: why your reasons outweigh theirs.

Step 1 and 2: understand the motion and define it

The motion is the only thing being decided. Write it as a yes-or-no question and underline the words that could be read more than one way. In “This house would ban homework in primary schools,” the open terms are “ban” (all homework or only compulsory homework?), “homework” (reading counts?) and “primary” (ages five to eleven?).

In most formats the first speaker on the proposition side sets the definition, and a fair one is the sensible one: the meaning a reasonable person would give the words. A definition built to make the motion unwinnable for your opponents is called a squirrel or a truism, and judges mark it down. If you are on the second side and disagree with a definition, say so early and say why, then argue within the definition anyway.

Step 3 and 4: build your case

Two or three reasons are enough for a seven-minute speech. More than three and each one is thin. Each reason should have the same four parts, often remembered as claim, reason, evidence, impact:

  • Claim: the sentence you want the audience to accept. “Homework in primary school widens inequality.”
  • Reason (the “because”): the link from evidence to claim. “Because children with quiet space and help at home benefit most, and those without fall further behind.”
  • Evidence: a fact, example, study or statistic that can be checked.
  • Impact: why it matters, and to whom. “Early gaps compound across later years of school.”

Learn the structure from a champion

Bo Seo, a world debating champion and Harvard’s former debate coach, argues that the main skill in debate is not talking but listening and testing an argument against its strongest opposition. His short lesson below is a good companion to this step.

Watch: Train for any argument with Harvard’s former debate coach (Big Think (Bo Seo)). A short lesson from a world debating champion on building and testing an argument.

Step 5: predict and prepare for the other side

Before the round, write the other side’s best case as if you were arguing it. This is sometimes called steelmanning. Then write one answer to each of their top two points. A good answer usually does one of three things: shows the point is wrong, shows it is true but unimportant, or shows your side deals with it better.

Keep your answers short. A rebuttal that takes ninety seconds to explain will not be remembered. The structure “They say, but, because, so” keeps it tight: they say X; but Y; because Z; so it does not change the outcome.

Step 6: during the round

Take notes in two columns, theirs and yours, so that you can match each claim to a response. Write the speaker’s words as exactly as you can, not your summary of them, because your summary will quietly turn into a weaker version.

When you rebut, name the point first: “On their argument about cost.” Then respond, then say why it matters. Judges and audiences cannot award you points they cannot locate.

If a format has questioning (points of information in parliamentary debate, crossfire in public forum, cross-examination in policy and Lincoln–Douglas), use questions to clarify or expose, not to make speeches. Ask one short question, listen to the full answer, and move on.

Step 7: close with comparison

The last speech is not another list of your points. It is a comparison. Name the two or three issues that decided the debate and say, on each one, why your side is ahead. “Both sides agree that inequality matters. The difference is that their evidence is about secondary students and ours is about primary.”

End on the question the audience should ask themselves, not on a slogan.

A ten-minute practice loop

You can improve without an opponent. Repeat this loop on any motion, two or three times a week.

  1. Pick a motion and flip a coin for your side (one minute).
  2. Write two reasons with evidence (three minutes).
  3. Speak your case aloud for one minute, timed (one minute).
  4. Write the best answer the other side would give (two minutes).
  5. Speak your rebuttal to it for one minute (one minute).
  6. Record yourself once a week and listen for filler words, speed and unfinished sentences (two minutes).

Seven mistakes beginners make

These are the patterns that cost the most points, in rough order of frequency.

Common beginner mistakes and the fix for each
MistakeWhy it hurtsFix
Arguing a different questionThe judge cannot compare two cases that do not meet.State the motion and your definition in the first thirty seconds.
Too many pointsEach one is shallow and none is remembered.Two or three reasons, each fully explained.
Claims without a “because”Assertion is not argument.After every claim, say why it follows.
Ignoring the other sideIt looks as though you cannot answer them.Rebut their top two arguments by name.
Attacking the personIt loses the audience and is a recognized fallacy.Attack the claim, not the speaker.
Reading from a scriptIt sounds flat and cannot adapt to what was said.Use short notes with headings only.
Running out of timeYour best point never lands.Practise with a timer; put your strongest point first.

Watch a full debate with a plan

Watching one full debate, with notes, teaches more than reading five tip lists. Pause after each speech and write: the main claim, its support, and the best answer to it. Then compare your notes to how the next speaker actually responded. Doha Debates’ full debates are moderated, end with an audience vote, and run long enough to see how arguments develop.

Watch: Artificial Intelligence | Full debate (Doha Debates). A full moderated debate with speakers on both sides and an audience vote.

Frequently asked questions

How do you start a debate?

Start by stating the motion in your own words, defining any term that could be read more than one way, and previewing your two or three main reasons. This takes about thirty seconds and tells the audience what to listen for.

How do I debate if I am a beginner?

Start with the ten-minute practice loop on a motion you find easy to argue, then move to one you disagree with. Watch a full debate with notes, and join a low-stakes room as a listener before you speak.

How long should a debate speech be?

It depends on the format. Common lengths are four minutes in public forum constructive speeches, six to eight in Lincoln–Douglas, policy and World Schools, and seven in British Parliamentary. Rebuttals are usually two to five minutes.

How do you prepare for a debate when you do not know your side?

Prepare both sides in brief. Write two reasons and the best objection for each, then use the time you have to deepen the side you receive. Impromptu formats give 15 to 30 minutes to do exactly this.

What should I do if I run out of things to say?

Return to comparison. Say which issues decided the debate and why your side is ahead on each. If time remains, restate your strongest reason with a new example rather than adding a new weak point.

Sources and further reading