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Learn how to build powerful arguments by backing up your ideas with solid reasoning and trustworthy sources.
People have been arguing and debating for thousands of years. But here's the thing: not every argument is a good argument. Over time, thinkers and writers figured out that the strongest arguments are the ones supported by real evidence and clear reasoning. Let's take a quick trip through history to see how this idea developed.
So here's the big question this lesson answers: How do you write an argument that people actually believe? The answer is simple but powerful — you support your claims with logical reasoning and relevant evidence from accurate, credible sources.
Before you can write a convincing argument, you need to understand four key ideas. Think of these as the ingredients in a recipe. If you leave one out, your argument won't hold together.
Let's look at a visual that shows how the parts of an argument connect. Notice how the claim sits at the top, supported by evidence, and reasoning is the bridge between them.
In the diagram above, notice how the claim sits at the top like a roof. It's held up by three columns of reasoning, each connected to a piece of evidence. At the very bottom, everything rests on the foundation of credible sources. If you remove any layer, the whole structure gets wobbly.
This is exactly how you should think about your argumentative essays. Every claim needs at least two or three pieces of evidence, and each piece of evidence needs reasoning that explains why it supports the claim.
One of the most helpful tools for writing strong arguments is called the C-E-R framework. C-E-R stands for Claim, Evidence, and Reasoning. Here's how each part works in your writing.
Your claim should be a clear, specific statement. Avoid vague claims like "This is bad" or "Everyone knows that." Instead, make a claim that someone could debate. A strong claim takes a clear position. For example: "Middle school students should have at least 30 minutes of recess each day."
Evidence is not just your opinion or something you heard from a friend. Relevant evidence (evidence that directly connects to your claim) comes from credible sources. It can be a statistic (a number or percentage from a study), a direct quote from an expert, a fact from a reliable website, or a real-world example. When you introduce evidence, always tell the reader where it came from. You might write: "According to the American Academy of Pediatrics…" or "A 2022 study published in The Journal of School Health found that…"
This is where many students stumble. After you share a piece of evidence, you must explain what it means and why it supports your claim. Don't just drop a fact and move on! Your reasoning should answer these questions: How does this evidence prove my point? Why should the reader care? What is the logical connection?
Before you use any piece of evidence, ask yourself: Is this source accurate (correct and factual)? Is it credible (written by someone who actually knows the topic)? Is it relevant (does it actually relate to my claim)? If the answer to any of these is "no," find a better source.
Not all sources are created equal. When you're looking for evidence, you need to be picky about where your information comes from. Here's a visual guide to help you tell the difference between credible and unreliable sources.
The CRAAP test is a handy tool you can use to evaluate any source. It stands for five things you should check: Currency (is the information recent enough?), Relevance (does it actually relate to your topic?), Authority (who wrote it — are they an expert?), Accuracy (can the facts be verified?), and Purpose (why was this written — to inform, persuade, or sell something?).
| Source Type | Example | Credibility Level |
|---|---|---|
| .gov website | CDC.gov, NASA.gov | Very High |
| .edu website | MIT.edu, Stanford.edu | Very High |
| Published research study | Journal of Pediatrics | Very High |
| Major news organization | The New York Times, NPR | High |
| Encyclopedia | Britannica, World Book | High |
| Wikipedia | wikipedia.org | Medium — good for starting research |
| Random blog or social media post | Someone's TikTok, personal blog | Low — not reliable for essays |
Let's walk through writing an argument paragraph step by step. Imagine you're writing an essay arguing that schools should offer more art classes. Here's how you'd build one body paragraph using the C-E-R framework.
See how the paragraph flows? Claim → Evidence → Reasoning. Each part does its job, and together they make an argument that's hard to argue with.
Now that you know how to build an argument, let's look at what makes some arguments strong and what causes others to fall apart. This comparison will help you spot problems in your own writing.
| Strong Argument ✓ | Weak Argument ✗ | Why It Matters |
|---|---|---|
| Uses specific evidence (statistics, quotes, data) | Uses vague statements ("everyone knows that…") | Specific evidence is harder to argue against |
| Names the source ("According to NASA…") | Doesn't cite sources ("Studies show that…") | Naming sources builds trust with the reader |
| Includes reasoning that connects evidence to claim | Drops evidence without explanation | Reasoning is the glue — without it, evidence is just a random fact |
| Uses credible, up-to-date sources | Uses random websites or old information | Outdated or unreliable sources weaken your entire argument |
| Evidence is relevant to the specific claim | Evidence is interesting but off-topic | Even great evidence is useless if it doesn't support your point |
Mistake #1: Evidence without reasoning. This is when you share a fact but never explain what it means. Imagine saying "80% of teens use social media" in an essay about school lunches. Even if you placed it in the right essay, just stating a fact without saying why it matters leaves your reader confused.
Mistake #2: Using unreliable sources. If your evidence comes from a random blog with no author listed, your reader has no reason to trust it. Always check your sources using the CRAAP test from Section 5.
Mistake #3: Being too general. Saying "lots of people agree" or "it's common knowledge" is not evidence. Real evidence has numbers, names, and specific details.
The skills you're learning now — making claims, finding evidence, and explaining your reasoning — are the foundation for everything you'll write in high school, college, and beyond. But as you grow as a writer, your arguments will get more sophisticated. Here's a sneak peek at what's ahead.
| What You're Learning Now (7th Grade) | What's Coming Next (8th–10th Grade) |
|---|---|
| Make a clear claim and support it with evidence | Make a claim, support it, AND address counterclaims (arguments against your position) |
| Use 1–2 credible sources | Use multiple sources and synthesize (combine) information from them |
| Explain reasoning in 1–2 sentences | Develop extended reasoning that considers cause-and-effect relationships and implications |
| Identify credible vs. non-credible sources | Analyze author bias and rhetorical strategies in sources |
| Write body paragraphs using C-E-R | Write full essays with introduction, body, counterargument, and conclusion |
One skill that will become especially important is dealing with counterclaims. A counterclaim is the opposite position from yours. In advanced writing, you don't just ignore the other side — you bring it up, and then explain why your argument is still stronger. This shows your reader that you've thought about the topic from all angles.
For now, focus on mastering the C-E-R framework. Once you can write a body paragraph that has a clear claim, strong evidence from a credible source, and logical reasoning that ties it all together, you'll be ready for anything that comes next.
Time to put your skills to the test! Try each problem before clicking "Show Answer." The problems start easy and get more challenging as you go.
In this lesson, you learned how to build arguments that people actually believe. Every strong argument starts with a clear claim — a specific, debatable statement that takes a position. That claim is supported by evidence, which includes facts, statistics, quotes, and examples drawn from accurate, credible sources like government websites, published studies, and expert opinions. But evidence alone isn't enough. You also need reasoning — the explanation that connects your evidence to your claim and shows your reader why the evidence matters.
You explored the C-E-R framework (Claim-Evidence-Reasoning) as a practical tool for building body paragraphs. You learned to evaluate sources using the CRAAP test (Currency, Relevance, Authority, Accuracy, Purpose) and to avoid common mistakes like dropping evidence without reasoning, using unreliable sources, or being too vague. These skills — making claims, finding credible evidence, and explaining your thinking with logical reasoning — are the foundation of persuasive writing that will serve you in every class and every stage of your education.