The Claim-Warrant-Impact Structure
Every strong argument in Parli, and in debate generally, has three parts: a claim, a warrant, and an impact. You will be able to identify each part in an argument and explain why missing the warrant makes an argument vulnerable to a one-line response.
Claim: the assertion
The claim is the one-sentence statement of what you're arguing, such as 'solitary confinement causes lasting psychological harm.' On its own, a claim is just an assertion — it carries no persuasive weight until it's backed up, and a judge cannot vote for a bare claim.
Warrant: the reasoning
The warrant explains why the claim is true — the logical or causal mechanism connecting cause to effect. In Parli, since you have no study to cite, your warrant might be a chain of reasoning ('isolating a social species from human contact for 23 hours a day removes the stimulation the brain needs to regulate mood and cognition, which is why isolation is used as a documented psychiatric stressor') or a well-known example ('this mirrors how sensory deprivation is used in interrogation because of its known psychological effects').
Impact: why it matters
The impact answers 'so what?' — it tells the judge why this argument should affect the ballot. An impact should be weighed in terms of magnitude (how big), probability (how likely), and timeframe (how soon), even in an evidence-free format, because judges still need a reason to prefer your side's world.
Testing your own warrants under prep pressure
A fast way to stress-test a warrant during prep is to ask 'why' three times in a row: state the claim, then ask why it's true, then ask why that reason is true, then ask why that is true. If you can't answer the third 'why' with something solid, the warrant is thin and opponents will find the gap; if you can, you've built a much deeper argument than a rushed one-line assertion.
A debater is building an argument against a motion to fully privatize prisons.
Claim: 'Privatized prisons increase recidivism.' Warrant: 'Private prison companies are paid per prisoner-day, which creates a direct financial incentive to keep prisoners cycling back rather than investing in rehabilitation programs that would reduce their paying customer base.' Impact: 'This means privatization doesn't just fail to fix the prison system, it actively locks in higher long-term crime rates and a permanent underclass of repeat offenders, which is a bigger harm than any short-term cost savings Government claims.'
1. What is the function of the warrant in an argument?
2. Which of the following best describes an 'impact' in argument structure?
3. True or False?
"A bare claim without a warrant is enough to win an argument in Parli."
Answer all 3 to check.
Build every argument as claim, then warrant, then impact, so a judge always knows what you're saying, why it's true, and why it matters.