Level 2 · Module 1: Claims, Reasons, and Evidence · Lesson 6

Building Your Own Case

conceptargument-reasoning

Knowing how to spot bad arguments is only half the skill. The other half is building your own case — starting with a clear claim, supporting it with relevant reasons and real evidence, checking your reasoning for gaps, and being honest about what you don’t know.

Why It Matters

In the past five lessons, you’ve learned what claims are, what makes a reason good or bad, what counts as evidence, why authority isn’t an argument, and how reasoning can go wrong. Those are powerful tools for evaluating other people’s arguments. But now it’s time to use those tools on yourself.

Building your own case means putting together an argument from scratch — one that could hold up when someone smart and fair asks hard questions about it. That’s harder than it sounds, because when you’re building your own argument, your brain wants to skip the hard parts. It wants to grab the first reason that sounds good and stop there. It wants to ignore evidence that doesn’t support your claim. It wants to assume your reasoning is solid without checking.

The mark of a strong thinker isn’t that their first argument is always right. It’s that they build their arguments carefully, check them honestly, and fix them when something doesn’t hold up. That’s what this lesson is about.

A Story

Mia’s Proposal

Mia wanted the school to allow students to eat lunch outside when the weather was nice. She felt strongly about it, and she was ready to argue her case to the principal, Mr. Choi. But her older brother, Andre, who was in middle school, told her something that stuck with her: “Don’t just walk in there with a feeling. Build a case.”

So Mia started with her claim: “Students should be allowed to eat lunch outside on days when the weather is good.” Clear. Specific. Someone could agree or disagree.

Then she worked on her reasons. Her first instinct was “because it would be fun.” That was true, but she could already hear Mr. Choi saying, “Fun isn’t a reason to change school policy.” So she dug deeper. She found two stronger reasons: studies showing that time outdoors helps students focus better in afternoon classes, and the fact that the cafeteria was overcrowded, with students eating in shifts because there weren’t enough seats.

For evidence, she counted the seats in the cafeteria (142) and the number of students who ate lunch during the main period (198). She printed out an article from a children’s health organization about the benefits of outdoor time. She asked the school nurse, who confirmed that many students complained of headaches and restlessness during the afternoon — which could be related to being stuck inside all day.

Then Mia did something her brother taught her: she tried to argue against herself. What would someone say to challenge her? “Kids will make a mess outside.” She added a plan for outdoor trash cleanup teams. “What about rainy days?” She specified that it would only apply when the weather was good, with the teacher on lunch duty making the call. “What about allergies and bees?” She noted that students could choose to stay inside — it wouldn’t be required.

When Mia finally met with Mr. Choi, he was impressed. Not because her argument was perfect — he raised a concern about supervision she hadn’t thought of — but because she had built a real case. She had a clear claim, strong reasons, actual evidence, and she’d anticipated objections. He said he’d bring it to the school leadership team.

It took two months, but the school started a pilot program for outdoor lunch. It wasn’t exactly what Mia proposed — they modified some details. But it happened because she’d built an argument that could survive hard questions, not just one that sounded good in her own head.

Vocabulary

Case: A complete argument that includes a claim, reasons, evidence, and responses to possible objections. Building a case means putting all those pieces together.
Objection: A challenge or concern someone raises about your argument. Good arguments anticipate objections and have responses ready.
Counterargument: An argument that goes against your claim. Instead of ignoring counterarguments, strong thinkers address them directly.
Cherry-picking: Choosing only the evidence that supports your claim while ignoring evidence that doesn’t. Cherry-picking makes an argument look stronger than it actually is.
Concession: Admitting that the other side has a point about something. Making a concession doesn’t mean you lose — it means you’re honest, and it often makes your argument stronger.

Guided Teaching

Let’s break down how Mia built her case, because she followed a process that works for any argument. Step one: she stated a clear claim. Not a vague feeling (“lunch should be better”) but a specific, arguable position (“students should be allowed to eat outside when the weather is nice”).

Why does a specific claim work better than a vague one? What would have happened if Mia walked into Mr. Choi’s office and said, “Lunch should be different”?

Step two: she found reasons that were relevant to the decision-maker. “It would be fun” is a reason, but it’s not one that helps a principal justify a policy change. “It helps students focus in afternoon classes” and “the cafeteria is overcrowded” are reasons that connect to things the principal actually cares about — student learning and practical logistics.

This is an important insight: a good reason isn’t just relevant to your claim. It’s relevant to your audience. What does the person you’re trying to convince actually care about?

Step three: she gathered real evidence. She didn’t just say the cafeteria was overcrowded — she counted the seats and the students. She didn’t just say outdoor time helps kids focus — she found an article about it. Numbers, data, and sources make an argument concrete instead of just a feeling.

Step four — and this is the step most people skip — she argued against herself. She imagined what someone would say to challenge her, and she prepared responses. This is one of the most powerful things you can do in an argument, because it shows you’ve actually thought it through. And it protects you from being surprised.

Try this right now: think of something you want to change at school or at home. State your claim clearly. Now try to argue against yourself — what would someone say to challenge your claim? Can you respond to that challenge?

One more thing about honesty in argument-building. Mia didn’t hide the messy parts. She didn’t pretend there were no concerns about outdoor lunch. She addressed them directly. And when Mr. Choi raised a concern she hadn’t thought of — supervision — she didn’t get defensive. She listened. That’s integrity in argument-making: you build the strongest case you honestly can, and you stay open to challenges you didn’t expect.

Pattern to Notice

The next time you want to convince someone of something — a parent, a teacher, a friend — try building a real case before you make your argument. Start with a clear claim. Find reasons that connect to what the other person cares about. Look for actual evidence. And then try to argue against yourself. You’ll find that this process sometimes changes your own mind, and that’s actually a good sign — it means you’re thinking honestly, not just trying to win.

A Good Response

A child who masters this lesson becomes persuasive in the best sense of the word. They learn to build arguments that are clear, supported, and honest. They anticipate objections instead of being blindsided by them. They know that a strong argument includes acknowledging what you don’t know or where the other side has a point. Most importantly, they learn that the process of building a case sometimes changes their own position — and that this is a feature, not a bug.

Moral Thread

Integrity

Integrity means building an argument you honestly believe in, using evidence you haven’t twisted or cherry-picked. It means being willing to follow the evidence even when it leads somewhere you didn’t expect.

Misuse Warning

A child who gets good at building cases might start using this skill to construct persuasive arguments for things they don’t actually believe or for positions that benefit only themselves. They might become very effective at getting what they want without caring whether their claim is actually true or fair. If you see your child building elaborate cases that always happen to serve their self-interest, ask them: “Do you actually believe this, or are you just good at arguing for it?” The skill of building a case is only valuable if it’s paired with the honesty to use it for things you genuinely believe are right.

For Discussion

1.What were the steps Mia followed to build her case? Can you list them in order?
2.Why wasn’t “because it would be fun” a strong enough reason for Mr. Choi? Was it wrong?
3.What does it mean to argue against yourself? Why is that step so important?
4.What is cherry-picking, and why is it dishonest?
5.Why did Mr. Choi take Mia’s proposal seriously even though it wasn’t perfect?
6.What’s a concession? Why does admitting the other side has a point sometimes make your argument stronger instead of weaker?
7.Think of something you’d like to change at school or at home. What would your claim be? What reasons and evidence would you use?

Practice

Build Your Case

1.Choose something you genuinely want to change or propose — at school, at home, in your neighborhood, or on a team you’re part of. Then build a complete case by working through each step:
2.1. State your claim clearly in one sentence. Make it specific enough that someone could agree or disagree.
3.2. List two or three reasons that support your claim. For each reason, ask: is this relevant to the claim? Is it relevant to the person I’m trying to convince?
4.3. Find at least one piece of real evidence — a number, a fact, an example, something someone could check.
5.4. Argue against yourself: write down two objections someone might raise, and write a response to each one.
6.5. Check for honesty: is there any evidence against your claim that you’re leaving out? If so, address it.
7.Share your case with a parent or family member and ask them to challenge it. See if your argument holds up, and if it doesn’t, revise it. The goal isn’t to have a perfect argument on the first try — it’s to build the habit of constructing arguments carefully instead of just saying what you feel.

Memory Questions

1.What are the steps for building a strong case?
2.What did Mia do before she went to see the principal?
3.Why is it important to find reasons that are relevant to your audience, not just to yourself?
4.What does it mean to argue against yourself, and why does it make your argument stronger?
5.What is cherry-picking?
6.What should you do when someone raises an objection you didn’t expect?

A Note for Parents

This lesson is a capstone for Module 1. It pulls together everything from the previous five lessons — claims, reasons, evidence, the limits of authority, and reasoning errors — and applies them to the practical skill of building an argument from scratch. Mia’s story models the complete process, including the step most people skip: arguing against yourself before presenting your case. The practice exercise is the most important part of this lesson, because building an argument is a skill that only develops through doing it. Help your child choose a topic they actually care about — the exercise works best when the stakes feel real. When they present their case to you, resist the urge to simply say yes or no. Instead, engage with the argument: ask questions, raise objections, and see how they respond. If their argument has a flaw, point it out gently and help them fix it. The goal is a child who can construct a thoughtful case for something they believe in — and who has the integrity to follow their own evidence even when it leads somewhere unexpected.

Share This Lesson

Found this useful? Pass it along to another family walking the same road.