Lincoln-Douglas Debate Prep with AI
Build LD cases with values, criteria, contentions, and rebuttal blocks.
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By the DebateOwl team
How do you build a Lincoln-Douglas debate case?
Choose a value the resolution should be judged by and a criterion narrow enough to tell the judge which impacts count. Then write two or three contentions that each prove your side meets that criterion, and expect the negative to accept your framework and argue you fail it. Under NSDA rules the affirmative constructive is six minutes and the negative's is seven, which fits one framework and two or three contentions. Prepare cross-examination questions that pin down the opponent's framework, and blocks for the arguments you expect most.
The NSDA round
Seven speeches and cross-examinations at 6-3-7-3-4-6-3, with four minutes of prep per debater.
Framework that does work
A value and a criterion the rest of the case actually depends on, instead of a label at the top.
A worked example and its turn
One affirmative contention on an original practice resolution, and how a negative turns it under the same criterion.
The round at NSDA times
Lincoln-Douglas is one debater against one. The National Speech & Debate Association (NSDA) writes resolutions that ask for a value judgment, and the topic changes several times a season. Under the NSDA High School Unified Manual, a round runs in this order:
| Speech | Who | Time |
|---|---|---|
| Affirmative constructive (AC) | Affirmative | 6 minutes |
| Cross-examination | Negative asks, affirmative answers | 3 minutes |
| Negative constructive (NC) | Negative | 7 minutes |
| Cross-examination | Affirmative asks, negative answers | 3 minutes |
| First affirmative rebuttal (1AR) | Affirmative | 4 minutes |
| Negative rebuttal (NR) | Negative | 6 minutes |
| Second affirmative rebuttal (2AR) | Affirmative | 3 minutes |
| Prep time | Each debater, used between speeches | 4 minutes |
The time split explains most LD strategy. The affirmative speaks first and last but has 13 minutes of speeches to the negative's 13, and the 1AR has four minutes to answer seven minutes of NC. Some tournaments allow more prep than four minutes, so read the invitation. The free debate timer with the LD preset runs this order and keeps each debater's prep bank.
What the value and criterion are for
The value is the goal the resolution should be judged by, such as justice, wellbeing or liberty. The criterion, sometimes called the standard or value criterion, is the test the judge uses to decide which side achieves that value better. Together they are the framework, and in a close round the framework decides which arguments count at all.
A criterion earns its place when it is narrow enough to exclude some impacts. "Maximising wellbeing" lets almost anything in, so the round turns into a contest of the biggest numbers. "Protecting the least advantaged" tells the judge that a benefit to most people does not outweigh a serious harm to the worst off. The narrower test is easier to attack, but it also gives you a reason to win when the negative's offense is larger in raw terms.
Each contention should then show how the resolution meets the criterion. If a contention would win under any framework, it is fine, but it does not need your framework, and your opponent can ignore the framework debate entirely.
Worked example: one contention and the turn
Practice resolution: Resolved: Cities ought to prioritize pedestrians over private cars when allocating street space
Value: Justice, defined as giving each person what they are owed as a member of the public.
Criterion: Protecting the least advantaged users of public space.
Contention 1: Streets are a shared public good, but car-first allocation gives most of that space to people who can afford a car. Children, many older people and people on low incomes travel on foot or by bus, so they get the least space and carry the most risk.
Impact under the criterion: Prioritizing pedestrians reallocates a public good toward the people the criterion says to protect first.
Negative turn: Accept the criterion and argue that the affirmative fails it. Many disabled people, rural commuters and night-shift workers without transit depend on cars, and they are among the least advantaged too. Pedestrian priority without replacement transit takes access from them.
Affirmative answer in the 1AR: Prioritizing is not banning: accessible parking, paratransit and delivery access stay. Then weigh: the affirmative helps more of the least advantaged, and the negative's harm can be fixed inside the affirmative world.
The turn works because it fights on the affirmative's own criterion. A negative who instead argued "economic growth matters more" would need to win a separate framework debate first, which costs time in a seven-minute NC.
Cross-examination in LD
Each debater gets one three-minute cross-examination. Spend it on the framework and on the one link you plan to attack. Useful questions get a commitment you can quote later: "Does your criterion let a benefit to the majority outweigh a harm to the worst off?" A yes or no either way gives you something for the next speech.
When you answer, keep replies short and stay consistent with the case. Conceding a definition is usually cheaper than defending a weak one for the whole round.
Common LD mistakes
- A value and criterion that no contention mentions again. If the framework disappears after the first minute, the judge decides on impacts alone.
- A criterion that is just the value restated, such as value "morality" and criterion "being moral". It gives the judge no test to apply.
- An NC that only attacks. The negative needs offense of its own, or the affirmative can win on a small risk of its advantage.
- A 1AR that tries to answer everything at the same depth. Group the NC's responses, answer the framework first, and extend one contention cleanly.
- A 2AR that introduces new arguments. Judges discount them because the negative has no speech left to respond.
A 15-minute LD drill
- Two minutes: write a value and criterion for both sides of the current resolution, or the practice one above.
- Three minutes: for your affirmative, write one contention in three sentences, ending with how it meets the criterion.
- Four minutes: write the negative turn against that contention under the same criterion, as if you were the opponent.
- Four minutes: deliver a 1AR answer to the turn out loud, timed with the LD preset's 1AR slot.
- Two minutes: write one cross-examination question that would have set up the turn, and one that would have prevented it.
In DebateOwl, Case Attacker runs the same test on a full case: paste the affirmative and it points to the weakest link. Crossfire is a cross-examination drill, where the AI questions you about your case or answers your questions from the other side. Sparring runs LD rounds at the NSDA speech times with a judged verdict at the end; the cross-examination periods are left out, so pair it with a Crossfire drill.
Frequently asked questions
How long is a Lincoln-Douglas round?
The speeches and cross-examinations add up to 32 minutes. With four minutes of prep for each debater, a round takes about 40 minutes.
Do I need a value premise and a criterion in every LD case?
Most traditional LD judges expect both. Some circuits use a single standard or a framework argument instead, but the purpose is the same: give the judge a test for weighing the round.
Can the affirmative and negative use the same value?
Yes, and it is common. When both sides share a value, the round usually turns on the criterion or on who better meets the shared framework.
Why is the 1AR so hard?
It has four minutes to answer a seven-minute negative constructive and the negative's cross-examination. Grouping arguments and answering the framework first saves the most time.