How to Cross-Examine in a Debate: Strategy, Questions and Examples
Cross-examination is a short, structured questioning of an opponent, used to clarify their case, expose weaknesses and set up your arguments. This guide explains its goals, how it works in policy, Lincoln–Douglas and public forum, gives question types with examples, and lists common mistakes.
Updated 2026-11-04
What cross-examination is
Cross-examination (often called CX, or crossfire in public forum) is a period in which one debater questions an opponent directly. The questioner controls the time. The respondent answers. It is not a speech, and it is judged by what it reveals.
The term comes from the courtroom, where a lawyer questions a witness called by the other side to test the evidence. Debate cross-examination uses the same idea, applied to arguments.
Three goals
Every question should serve one of these.
| Goal | What you are doing | Example question |
|---|---|---|
| Clarify | Making sure you understand the case. | “When you say the ban is “universal”, does that include exemptions?” |
| Expose | Revealing a gap, contradiction or unsupported claim. | “Your source is from 2012; do you have anything more recent?” |
| Set up | Getting an admission you will use later. | “So you accept that students with disabilities rely on laptops?” |
How it works in different formats
Each format uses questioning a little differently. Check the current rules for your competition.
| Format | Name | Typical length | Who asks |
|---|---|---|---|
| Policy | Cross-examination | 3 minutes after each constructive speech | The opposing debater questions the speaker who just spoke |
| Lincoln–Douglas | Cross-examination | 3 minutes after each constructive | The opposing debater questions the speaker who just spoke |
| Public forum | Crossfire | 3 minutes after each pair of speeches | Both debaters ask and answer |
| British Parliamentary and World Schools | Points of information | About 15 seconds each, during speeches | The opposing side can offer; the speaker may accept or decline |
Seven question types
Mix these as the situation requires.
- Clarifying: “What do you mean by…?”
- Evidence: “Where does that figure come from, and what year?”
- Mechanism: “How exactly does X lead to Y?”
- Scope: “Does your argument apply in every case or only some?”
- Consistency: “Earlier you said X; how does that fit with Y?”
- Concession: “Would you agree that…?” (only when you are sure of the answer)
- Alternative: “Why is your option better than [another option]?”
A worked example
Motion: This house would make public transport free. The opposition has claimed that free fares would cause overcrowding.
Questioner: “You said free fares would cause overcrowding. Do you have evidence of that from a city that has done it?” Respondent: “It is a risk.” Questioner: “So it is a risk, not a result?” Respondent: “Yes.” Questioner: “And some cities that have introduced free fares have increased service at the same time?” Respondent: “Some have.”
Each question is short and closed, and the answers set up a point for the next speech: “Our opponents’ overcrowding claim is a risk, and cities that have done this show it can be handled.”
Watch an experienced questioner
Moderators and panelists in long-form debates use many of the same techniques: restating a claim, asking for evidence, and closing a point. Watch how the Intelligence Squared panel questions a claim, then lets the answer stand.
Watch: The Great A.I. Debate: Should We Fear the Digital Revolution? (Intelligence Squared). Experts argue for and against fear of AI, then answer audience questions.
Rules of good cross-examination
Follow these rules and your questions will land.
- Know your purpose before you stand: clarify, expose or set up.
- Ask short, closed questions. One fact per question.
- Do not ask “why” unless you want a speech in response.
- Control the time. Politely interrupt long answers: “Thank you, that answers it.”
- Listen to the answer and follow up on it.
- Be courteous. A calm tone makes a damaging answer more damaging.
- Use what you learn in your next speech.
Questioning in an online room
Online, questioning works best when it is short and visible. A moderator can set a clear window, such as ninety seconds, and let each side ask one speaker a few questions in turn. Chat can collect audience questions that the moderator reads out, which keeps the exchange civil and gives quieter participants a way in. The same rules apply: ask one thing at a time, listen to the answer, and use it later.
Answering questions well
When you are the respondent, stay calm and answer directly. If a question is unclear, ask for it to be repeated. If you do not know, say so rather than guessing. If a question rests on a false premise, say what is wrong with the premise before you answer. Do not give long speeches; the questioner can interrupt, and the judge will notice.
Planning a cross-examination before the round
Good cross-examination is mostly prepared. Before the round, list the three claims in the opposing case you are most likely to challenge. For each, write two questions: one to pin down exactly what they are claiming, and one to expose the weakest assumption. Then decide the one admission you most want, and sequence your questions so it arrives last. If time runs short, you will have made your point. During the round, adjust to what they actually say, and write down their answers word for word so that you can quote them in your next speech.
Common mistakes
These errors cost points.
- Making a speech instead of asking a question.
- Asking a question you cannot handle the answer to.
- Arguing during cross-examination. Save it for your speech.
- Rudeness or sarcasm.
- Failing to use the answers later.
- Using the time to prepare instead of probing.
Frequently asked questions
What is cross-examination in debate?
It is a period where one debater questions an opponent directly to clarify, expose weaknesses or set up an argument. It is used in policy and Lincoln–Douglas, and as crossfire in public forum.
What are good cross-examination questions?
Good questions are short, closed and aimed at one purpose: clarifying a claim, challenging evidence, or getting an admission that helps you later.
What is the difference between cross-examination and crossfire?
In cross-examination, one debater asks and the other answers. In public forum crossfire, both debaters can ask and answer.
Can you argue during cross-examination?
It is better not to. Use the time for questions and make your arguments in your speech. Judges usually give credit for what the questions reveal, not for speeches in cross-examination.
What is a point of information?
In parliamentary formats, a short question or challenge offered during an opponent’s speech. The speaker can accept or decline, and good teams accept some to show confidence.
Sources and further reading
- Cross-examination (Wikipedia)
- Policy debate (Wikipedia)
- Lincoln–Douglas debate format (Wikipedia)
- Public forum debate (Wikipedia)
- Debate competition events (National Speech & Debate Association)