What is an argument?
In everyday talk, an "argument" is a fight. In thinking and writing it means something calmer: a claim supported by reasons and evidence.
- Claim: what you want the reader to accept. ("Our school should start later.")
- Reason: the "because" that supports the claim. ("Teenagers sleep later by nature.")
- Evidence: facts, data, examples, expert statements that back the reason.
A claim with no reasons is only an opinion. An argument tries to convince people who disagree, using things they can check.
Building an argument step by step
- Write the claim in one clear sentence.
- Find 2 or 3 reasons. Each one answers "why should I believe this?"
- Add evidence to each reason: a number, a fact, a real case, a source you trust.
- Link reason to claim. Say why the reason matters for the claim. This link is sometimes called the warrant.
- Think of the best counter-argument. What would a smart person who disagrees say?
- Answer it with a rebuttal: show it is wrong, small, or already handled.
In a debate you do the same, but out loud and in time. Order your points from strongest to weaker, and start with the one your listener cares about most.
Evidence: studies, statistics and cases
Different kinds of evidence do different jobs:
- Statistics tell you how big or how common something is. ("7 out of 10 students".) Ask: how many people were asked and who?
- Studies test a cause carefully. Ask: who did it, and was the test fair?
- Cases and examples make an idea real, but one case may not be typical.
- Expert statements help when the expert knows this exact topic and has no reason to lie.
Good evidence is accurate, recent enough, from a trustworthy source, and typical, not picked only because it agrees with you.
Counter-argument and rebuttal
A counter-argument is a reason on the other side. A strong writer does not hide it. The writer states it fairly and then gives a rebuttal.
Three ways to rebut: (1) Deny it: show a fact is wrong. (2) Shrink it: the harm or benefit is small compared with yours. (3) Absorb it: say "yes, and here is how we handle that".
Never attack the person. Answer the point. Attacking the speaker instead of the point is a fallacy (see Logical fallacies).
Judging an argument: criteria for evaluation
When you read or hear an argument, check it with these questions:
- Relevance: does each reason really connect to the claim? A fact about cricket does not help a claim about school timings.
- Sufficiency: is there enough evidence, or only one weak example? One story is rarely enough.
- Accuracy: are the facts true and from a good source?
- Validity of reasoning: if the reasons are true, does the claim really follow?
- Fairness: does it deal with the best counter-argument, or ignore it?
Give each question a mark. Where it scores low, say exactly what is missing. This makes your evaluation more than "I agree" or "I disagree".
Try it: build and test your own argument
Pick a claim you care about, such as "Cycling to school is better than going by car". Write 2 reasons and 1 piece of evidence for each. Write one counter-argument and your rebuttal. Then open the 3D table and copy your numbers into the sliders. Does your claim stand? What would make it stronger?
Key formulas and definitions
- Argument = Claim + Reasons + Evidence
- Strong argument = relevant + enough + accurate + valid + fair
- Counter-argument → Rebuttal (deny, shrink or absorb)
- Claim → because (reason) → shown by (evidence) → so (link)
Worked examples
1. Name the claim, reason and evidence: "We should plant more trees on our street, because trees cool the air. A town study found streets with trees were 3 °C cooler."
Claim: plant more trees on our street. Reason: trees cool the air. Evidence: the study that found tree-lined streets 3 °C cooler.
2. Is this reason relevant? Claim: "The school canteen should serve more fruit." Reason: "Our football team won last week."
Not relevant. Winning a match does not show why the canteen needs more fruit. A relevant reason would be about health or student choice.
3. A writer says "Online classes are bad" and gives only one story about his cousin. Judge the evidence.
Not sufficient. One story may not be typical. The writer needs more cases, a count or a study to support the claim.
4. Counter-argument: "Longer school days tire students." Write a rebuttal for the claim that the school day should be longer.
One rebuttal: "The extra hour would be games and art, not more lessons, so students would be refreshed, not tired." This absorbs the counter-argument and explains how it is handled.
5. A claim has 2 reasons. The first has 3 pieces of evidence, the second has 1. How many pieces of evidence in all? Which reason needs more?
3 + 1 = 4 pieces. The second reason is weaker and needs more evidence.
6. A speaker says: "My opponent lives in a big house, so his idea of saving water cannot be right." What is wrong?
It attacks the person, not the idea. The house has nothing to do with whether the water-saving idea works. The reasoning is not valid and the point is not relevant.
Common mistakes
- Giving only a claim, repeated in different words. A restatement is not a reason.
- Choosing evidence that agrees with you and hiding the rest.
- Skipping the counter-argument. This makes the argument look weak.
- Attacking the person who made the argument instead of the argument.