Why Do We Need to Evaluate Arguments?
People have been making arguments—and trying to figure out which arguments are trustworthy—for thousands of years. Imagine living in ancient Greece, where citizens voted directly on laws. If someone stood in the public square and shouted, "We should build a new wall around the city!" the crowd needed a way to decide: Is this person giving real reasons, or just trying to scare us? That question is just as important today, when you scroll through news articles, social media posts, and advertisements every day.
Here's a quick look at how the skill of evaluating arguments has developed over time.
The big question this lesson answers is simple but powerful: When you read someone's argument, how do you figure out whether it actually holds up?
Core Definitions You Need to Know
Before you can evaluate an argument, you need to understand the building blocks. Think of these five terms as the tools in your "argument detective" toolkit.
Argument
Claim
Evidence
Reasoning
Relevance & Sufficiency
Mapping an Argument — A Visual Guide
The diagram below shows how the pieces of an argument fit together. Start at the top with the central claim, then look down to see the supporting claims and the evidence beneath each one. The arrows represent reasoning—the logical links that connect everything.
Notice how the diagram looks like an upside-down tree. The central claim sits at the top, and everything below it holds it up. When you evaluate an argument, you're basically checking each branch and root to see if it's strong enough to support the whole tree.
A Step-by-Step Process for Evaluating Arguments
Now that you know the vocabulary, here's a repeatable process you can use every time you read an informational text that makes an argument. Think of these as your "detective steps."
When you put all six steps together, you can read any informational article and form a thoughtful opinion about whether its argument is strong or shaky.
Types of Evidence & How Strong They Are
Not all evidence is created equal. Some types are very strong and hard to argue against, while others are weaker and easier to poke holes in. The diagram and table below will help you recognize each type and judge its power.
| Evidence Type | What It Looks Like | Strength | Watch Out For… |
|---|---|---|---|
| Personal anecdote | "My cousin tried this and it worked." | Weak | One person's story doesn't prove something is true for everyone. |
| Emotional appeal | "Imagine how awful it would be if…" | Weak to moderate | Feelings are real, but they don't replace facts. |
| Real-world example | "In Japan, schools start later and test scores rose." | Moderate | One example is a start, but is it typical or an exception? |
| Expert opinion | "Dr. Park, a sleep researcher, states…" | Strong | Is the expert actually qualified in this specific topic? |
| Statistics / research | "A 2023 study of 5,000 students found…" | Very strong | Where did the data come from? Was the sample large enough? |
As you move from left to right on the spectrum, the evidence gets harder to argue against—but only if it is relevant and sufficient. A powerful statistic about basketball doesn't help an argument about school lunch menus!
Worked Example — Evaluating a Real Passage
Let's walk through a short persuasive passage together, step by step. Read the passage first, then follow along as we evaluate its argument.
Common Reasoning Pitfalls to Watch For
Authors sometimes use tricks—on purpose or by accident—that make an argument seem strong when it actually isn't. These are called logical fallacies. Here are the most common ones you'll run into as a 7th-grade reader.
| Fallacy | What It Means | Example |
|---|---|---|
| Hasty Generalization | Drawing a big conclusion from too little evidence. | "My two friends hate math, so math must be a useless subject." |
| Appeal to Emotion | Using fear, pity, or excitement instead of evidence. | "If we don't ban phones in school, students' lives will be ruined!" |
| Straw Man | Twisting the other side's argument to make it easier to attack. | "People who want recess say kids should just play all day and never learn." |
| Bandwagon | Claiming something is true just because "everyone" believes it. | "Everyone knows that longer school days are bad, so they must be." |
| False Cause | Assuming that because two things happened together, one caused the other. | "Grades went up the same year we got new uniforms, so uniforms made grades rise." |
| Ad Hominem | Attacking the person instead of the argument. | "Coach Lee says we need more funding for arts, but he's not even an artist." |
Where This Skill Takes You Next
The ability to evaluate arguments is one of the most important skills you'll develop across all your years of school—and beyond. Right now in 7th grade, you're focusing on informational texts: articles, editorials, and speeches. But this same set of thinking tools shows up in more advanced work later on.
| What You're Learning Now | Where It Goes Next |
|---|---|
| Identifying a central claim and supporting claims | In high school, you'll analyze how authors build multi-layered arguments with counterarguments and rebuttals. |
| Checking if evidence is relevant and sufficient | In college and careers, you'll evaluate research papers, legal cases, and business proposals using the same questions. |
| Spotting logical fallacies | Formal logic courses teach symbolic reasoning—turning arguments into equations you can prove or disprove. |
| Evaluating one argument in a passage | In AP and college English, you'll compare multiple arguments on the same topic, weighing which one is most convincing and why. |
The Common Core standard you're practicing—RI.7.8—is the foundation. Every time you ask, "Does this evidence really prove this point?" you're exercising the same critical thinking muscle that scientists, journalists, lawyers, and everyday citizens use to make smart decisions.
Practice Problems
Try these five problems on your own. Click "Show Answer" to check your thinking. They start easy and get more challenging!
Putting It All Together
When you read an informational text that tries to persuade you, your job is to be a thoughtful detective. Start by identifying the central claim—the main point the author wants you to believe. Then trace the supporting claims and examine the evidence beneath each one. Ask yourself: is each piece of evidence relevant (does it actually connect to the claim?) and sufficient (is there enough of it to be convincing?). Check the reasoning—the logical links between evidence and claims—and watch for logical fallacies like hasty generalizations, bandwagon appeals, and emotional manipulation.
Remember, not all evidence is equally powerful. Statistics and research tend to be the strongest, while personal anecdotes are the weakest—though any evidence can be misused. By practicing this six-step evaluation process, you're building a skill you'll use in every class, every career, and every time you read the news. You're not just a reader anymore—you're a critical thinker.