How to judge whether an argument holds up
TEAS 7 outline: Evaluate an argument
- Find the claim first: the point the author wants you to accept.
- Good evidence is relevant and checkable, like records, measurements, or studies.
- One person's story or the author's feelings is weaker support.
- Watch for overgeneralizing, false cause, appeals to emotion, and either/or choices.
- New evidence that answers the main objection strengthens an argument most.
Key facts
- An argument is a claim (the point the author wants accepted) supported by reasons and evidence.
- Evidence counts only if it is relevant: it must make the claim more likely to be true, not just sit near the topic.
- Checkable support (records, measurements, studies) is stronger than one person's story or the author's feelings.
Show all 7 key factsShow fewer
- Overgeneralization (hasty generalization) draws a broad conclusion from a sample that is too small or unrepresentative.
- False cause (post hoc) assumes that because B happened after A, A caused B.
- An appeal to emotion asks you to accept a claim because of how it makes you feel rather than because of reasons that bear on it.
- An either/or (false dilemma) argument offers only two options when others exist; new evidence that answers the main objection strengthens an argument most.
Quick check1 question · 2 more at the end
Keep the Library Open Later
A letter to the editor of the Riverside Gazette
The Riverside Public Library closes at 6 p.m. on weekdays, and the city council should extend those hours to 9 p.m. Many residents work until 5 p.m. or later, so the current schedule leaves them almost no time to borrow books, use the computers, or attend programs.
The library's own records support this change. Last spring, the library stayed open until 9 p.m. on Thursdays for a six-week trial. According to the library's annual report, an average of 140 people visited after 6 p.m. on those evenings, and more than half of them used the public computers to apply for jobs or take online classes.
Later hours would also help students. The high school's study hall ends at 4 p.m., and some teenagers do not have reliable internet at home.
Some council members say the budget is too tight. However, my neighbor visited a library in another state that stays open until 10 p.m., and she said it was always busy, so extra hours clearly pay for themselves. And anyone who has watched a tired parent drive across town after work, only to find the library doors locked, knows how heartbreaking that moment is.
The choice is simple. Either the council extends the hours, or it admits that it does not care about working families.
Which reasoning flaw appears in the final paragraph of the letter?
Correct answer: C.
An either/or argument (false dilemma) squeezes a decision into two choices when more exist. The council could, for example, extend hours on only some nights or test a later closing time again, so "extend the hours or admit you don't care" leaves out real options. Always match the flaw to the exact sentence the question points to, because one passage can contain several different flaws.
A This describes overgeneralization, which appears in the neighbor sentence of the fourth paragraph, not in the final paragraph.
B The final paragraph makes no claim that one event caused another; this is the false-cause flaw, which the letter does not use there.
C Correct: the author offers only two choices, extend the hours or admit not caring, ignoring options such as extending hours on some nights.
D The final paragraph does not use records at all, and the passage gives no sign that the trial data are outdated.
Full lesson
Each part starts with its main idea. Open a part when you want the details.
The short answer: To evaluate an argument, first find the claim, the point the author wants you to accept. Then check whether each reason is backed by relevant, checkable evidence. Finally, look for flaws: overgeneralizing from a few cases, assuming what came first caused what came next, swapping feelings for facts, or offering only two choices.
1 What are the parts of an argument?Every argument has one claim held up by reasons and evidence. 1 min
Every argument has one claim held up by reasons and evidence. The claim is the point the author wants you to accept. Reasons say why, and evidence is the proof behind each reason.
| Part | Question it answers | Signal words |
|---|---|---|
| Claim | What does the author want me to believe or do? | should, must, needs to, the best |
| Reason | Why should I believe it? | because, since, for one thing |
| Evidence | How do we know the reason is true? | according to, data show, in a study, records |
| Counterargument | What would a critic say? | some argue, critics say, however |
A sentence that sounds important is not automatically the claim. Ask which sentence every other sentence is trying to support.
2 How do you evaluate an argument step by step?Use the same four steps on every argument passage. 1 min
Use the same four steps on every argument passage. They turn a gut feeling into a checklist you can finish in about a minute.
- Find the claim. Put it in your own words in under ten words.
- List the reasons. Count them; most short passages have two or three.
- Test each reason. Is it relevant to the claim? Is it backed by something checkable?
- Hunt for flaws and gaps. Name any flaw, and notice whether the author answers the strongest objection.
Example text:
Our clinic should replace paper intake forms with tablets. Patients type their own answers on a tablet, so staff no longer copy handwriting into the computer, a step where errors creep in. Two patients told me the tablets at another clinic were easy to use, so everyone will find them easy. Our waiting room was also just repainted. Either we switch now or we keep losing patients to other clinics.
Walk-through:
- Claim: switch from paper forms to tablets.
- The first reason, removing a copying step, is relevant and could be checked against error records.
- "Two patients… so everyone" is overgeneralization from a tiny sample.
- The fresh paint is true but irrelevant; it says nothing about forms.
- "Either we switch now or we keep losing patients" is a false either/or. The clinic could pilot tablets or improve the paper forms.
3 How can you tell relevant support from irrelevant support?Relevant support makes the claim more likely to be true, while irrelevant support only shares a topic with it. 1 min
Relevant support makes the claim more likely to be true, while irrelevant support only shares a topic with it. Ask, "If this detail were false, would the claim be weaker?"
- Relevant: a records-based count, a measurement, a study, an expert finding tied to the claim.
- Weak: one person's story, the author's feelings, what "everyone" thinks.
- Irrelevant: true details about the setting, the author, or a side issue.
The strongest addition to any argument is new, checkable evidence that answers the main objection. If critics say a plan costs too much, cost figures help more than another moving story.
4 Which reasoning flaws show up most often?Four flaws cover most of the weak spots you will see in short argument passages. 1 min
Four flaws cover most of the weak spots you will see in short argument passages. Learn the pattern, not just the name.
| Flaw | What it looks like | Quick test |
|---|---|---|
| Overgeneralization | "My two neighbors…, so all residents…" | Is the sample big and typical enough? |
| False cause | "We changed X, and then Y happened, so X caused Y." | Could something else explain Y? |
| Appeal to emotion | "Imagine the heartbreak of…" with no facts | Remove the feeling. Is any reason left? |
| Either/or | "Either we do this or disaster follows." | Are there really only two options? |
Emotion by itself is not a flaw. A personal story that sits next to solid data can make an argument vivid; the problem is a story that replaces the data.
Common mistakes
The traps students fall into most. Read these before you practice.
Watch out: A sentence that supports the claim with a reason is evidence, not the claim itself; the claim is what all the reasons point toward.
Watch out: A true, interesting detail is not relevant support unless it makes the claim more likely to be true.
Watch out: A vivid story about one person is an anecdote, not proof about everyone.
Watch out: Emotional language is a flaw only when it replaces reasons; feelings attached to solid evidence are not automatically a fallacy.
Watch out: Match the flaw to the exact sentence the question names; a passage can contain several flaws in different places.
How to remember it
Carry four letters into every argument passage, C-R-E-F, for claim, reasons, evidence and flaws. Read once with those letters in mind, and most answer choices sort themselves into "fits" and "doesn't fit."
Self-check:
- Write the claim of the example text in under ten words.
- Pick the one reason in it that could be checked with records.
- Name the flaw in "Either we switch now or we keep losing patients" and give a third option.