Building Arguments With Evidence

A strong argument is more than an opinion. It is a claim backed up by evidence that actually proves the point, plus reasoning that explains the connection. This topic focuses on how to build that structure from the ground up: writing a clear claim, choosing facts and examples that truly fit, and explaining why the evidence matters. For a closer look at how to take an argument further with multiple viewpoints, see Developing Persuasive Arguments With Evidence.

An argument has three working parts. The claim is the point you are trying to prove. The evidence is the facts, examples, or data that back it up. The reasoning is the explanation that connects the evidence to the claim so the reader does not have to guess why it matters.

Many writers stop after stating a claim and dropping in a fact. That leaves a gap. A reader can see the claim and the evidence sitting next to each other, but nothing tells them how the evidence proves the point. Building a real argument means closing that gap every time.

Think of an argument as a chain with three linked parts. If one link is missing or weak, the whole chain fails to hold together.

Notice that reasoning is not just a restatement of the evidence. It answers the question, "so what?" It tells the reader exactly why the fact or example counts as proof.

Not every fact belongs in your argument, even if it is true and interesting. Strong evidence has to be relevant, meaning it connects directly to the specific claim you are making. Before using a fact or example, ask three questions:

• Does this directly support my claim, or is it only loosely related?
• Is this information accurate and up to date?
• Would a reader need more explanation to see the connection?

Facts and statistics show that a claim is backed by real data. Examples make a claim concrete by showing it in action. A mix of both usually makes an argument stronger than relying on just one type of evidence.

Claim: Schools should offer a longer lunch period.

Weak version (missing reasoning): "Schools should offer a longer lunch period. A study found that students who eat lunch for less than 20 minutes eat fewer vegetables." This drops in a fact but never explains the connection.

Stronger version (claim, evidence, reasoning): "Schools should offer a longer lunch period. A study found that students who eat lunch for less than 20 minutes eat fewer vegetables and more processed snacks. This shows that a rushed lunch period pushes students toward quick, less healthy choices, so extending the time would support better eating habits during the school day."

The second version works because the reasoning sentence explains exactly why the evidence matters. It connects the fact back to the original claim instead of leaving that step to the reader.

Claim: The main point or position that an argument sets out to prove.

Evidence: Facts, statistics, or examples used to support a claim.

Reasoning: The explanation that connects a piece of evidence to the claim it supports.

Relevant Evidence: Evidence that is directly connected to the specific claim, not just loosely related.

Anecdotal Example: A specific story or situation used to make an abstract claim more concrete.

Counterclaim: An opposing point of view that a strong argument acknowledges and responds to.

Related lessons

• Presenting Claims With Supporting Evidence