Cross-Examination & Rebuttals
Clash, signposting, refutation, and the weighing structures that turn points into ballots.
Cross-Examination
What cross-examination is for
CX is not debate — it's setup. You're building material for your next speech, not trying to 'win' CX. Watch Harvard's National Debate Tournament finals and you'll see champions use CX almost entirely to pin down definitions and concessions.
Key Points
- Extract concessions you will cite in your next speech.
- Narrow the opponent's argument so they can't pivot in rebuttal.
- Expose lack of warrant or contradictory evidence — but save the kill for the next speech.
Six question types that work
Definition
'When you say X, do you mean narrow definition A or broader definition B?'
Source check
'What's the year on your evidence? Is that the same source on the next contention?'
Link challenge
'Your harm is Y — walk me through how Z causes Y.'
Impact comparison
'If our plan prevents X deaths and yours saves Y, which is larger?'
Internal contradiction
'On contention 1 you argued market failure; on 2 you praised the same market. Which is it?'
Leading concession
'You'd agree that all else equal, more transparency is better than less?'
Answering CX
When you're the one being cross-examined, remember three rules.
Key Points
- Direct answers first, then explain. Dodging looks evasive to every judge.
- If you don't know, say 'I'll address that in my next speech' — don't invent evidence.
- Stop at the end of your sentence. Don't fill silence — the questioner gets less time for their next ambush.
Rebuttals
The four-step refutation
Every response to an opponent's argument follows the same structure.
Key Points
- 1. They say: one-sentence restatement of their argument.
- 2. But: your counter-claim.
- 3. Because: your warrant (evidence or logic).
- 4. Therefore: the comparative impact — why your response matters more than their argument.
Signposting
Good signposting tells the judge exactly where on the flow to put each response. Bad debaters make judges guess.
Examples
The correct form locates the argument on the flow; the incorrect form forces the judge to find it.
Impact weighing
Judges decide close rounds on weighing — which side's impact matters more. Provide the weighing for them in your rebuttal speeches.
Magnitude
How big is the impact? Number of people affected.
Probability
How likely is the scenario? A small chance of extinction isn't always bigger than a certain mild harm.
Timeframe
When does the impact hit? A 5-year harm usually outweighs a 50-year one.
Reversibility
Can it be undone? Irreversible harms carry more weight (species extinction, nuclear use).
FAQ
How aggressive should I be in CX?
Firm, not rude. Cutting off rambling is fine ('I need to move on'). Personal attacks, sarcasm, or raising your voice lose ballots. The NSDA explicitly scores decorum.
What if my opponent drops an argument?
Extend it — restate the argument and the impact in your next speech so the judge flows it as conceded. Then weigh: 'They dropped our water scarcity contention — that's a conceded impact of 4 billion people without reliable drinking water.'
Can I introduce new arguments in rebuttal?
Generally no. New responses to arguments raised by the other side are fine; wholly new offensive arguments in the last speech (or after constructives in LD/PF) are usually ruled out.
Continue learning
Explore related MUN guides to deepen your skills.