Every room until now asked how something was said. This one asks whether it follows. An argument has parts — premises, a conclusion, and a warrant connecting them — and it can fail at any of the three while every sentence in it stays true. So the two things worth learning are the shape of a working argument and the standard ways one breaks. Two warnings come with that. Naming a fallacy is not refuting it: you have to show the exact step that fails. And spotting a bad argument does not make the conclusion false — bad arguments are given for true claims every day, which is why the honest move is to say the argument does not establish it, not that it is wrong. Five tabs — cards for the parts and the classic failures, hints with the three questions, a quiz built on arguments that are valid and unsound, and a workshop where you diagnose arguments and repair one.
Two premises and a conclusion. Both premises are true — the register really was checked twice — and I have no quarrel with either. So where is there anything to examine?
An argument has premises, a conclusion, and a warrant connecting them — and the warrant is almost never written down, which is why it is where most arguments break. So state the warrant out loud and test it. Two warnings: naming a fallacy is not showing it, and a failed argument leaves the conclusion open rather than false.
What people get wrong
⚠️People often think…
The premises are true, so the argument is fine.
An argument is not a list of true statements — it is a movement from some to another, and the movement is a separate thing. Premises true, conclusion true, and the step between them can still not hold. That step is the warrant, and it is almost never on the page, so a reader who checks every sentence for truth will pass an argument that fails.
The question is not “is it true?” but “does it follow?”
⚠️People often think…
That is a slippery slope. I have refuted it.
The name is a category, and whether the argument belongs in it is exactly what is in dispute. If the writer HAS given a reason for each link, it is a legitimate prediction and your label is false. Quote the specific step, state the warrant it needs, show that warrant is not available. The name is a shorthand for a demonstration you still owe.
Quote the step. The label alone earns nothing and can be wrong.
⚠️People often think…
The argument was fallacious, so the conclusion is false.
That is the fallacy fallacy, and it is invalid. People give terrible reasons for true claims constantly — out of haste, or because they know something they cannot articulate. A failed argument tells you nothing about the claim, so the honest and more demanding sentence is: this argument does not establish it. You are still obliged to find out.
A failed argument leaves the question open, not settled against.
Premises, warrant, conclusion
1Watch one
Diagnose: “Every successful shop on this street opens on Sundays, so Sunday opening causes success.”
Premise: all the successful shops open on Sundays. Suppose it is true — we are not disputing it.
Warrant, stated out loud: if every success shares a feature, that feature caused the success.
Test it: what about the shops that opened on Sundays and closed anyway? They are not on the street to be counted. That is survivorship bias.
Conclude honestly: the argument does not establish it. Sunday opening may help — but you would need the shops that failed, and nobody has them.
2Do one with me
Name each part or failure.
The unwritten rule that lets you cross from premises to conclusion is the
An argument whose conclusion follows IF the premises are true is
Treating “after” as “because” is
💬One sentence, then you move on
Why can an argument fail even when every sentence in it is true?
3Try one
After showing an argument fails, you say it does not ____ the conclusion. One word.
I want a hint first
It has not managed to put the conclusion on firm ground.
💬Last one — then you're done here
Two things rise together. Name all four explanations and say which is usually strongest.
Where this goes
Where this lives
Every headline that says a study shows something. Every argument at a table that ends because somebody was rude rather than wrong. Every chain of consequences nobody defended a single link of.
What this feeds
Next room: back to the page, and the marks that decide what a long sentence is claiming.
Find one argument today and state its warrant out loud.
One card at a time — tap “Show me” to check yourself, then Next. Start at Foundation; when those feel easy, climb.
Helpful Hints
⚡ The one idea
An argument can fail while every sentence in it is true. The premises can be true, the conclusion can be true, and the step between them can still not hold — that step is the warrant, and it is almost never written down. So the analysis is not “is this true?” but “does this follow?”, and the answer lives in the join rather than in either end. Two consequences: naming a fallacy is not refuting it, and finding a bad argument does not make the conclusion false.
📐 The parts of an argument
Part
What it is
Fails when
Premise
something offered as already agreed
it is false, or not actually agreed
Conclusion
what the premises are meant to get you to
it says more than the premises support
Warrant
the unwritten rule letting you cross
it is not true, and nobody stated it
⚖️ Valid is not the same as true
An argument is VALID when the conclusion would have to follow IF the premises were true. It is SOUND when it is valid and the premises are actually true. So a valid argument can reach a false conclusion from false premises, and a true conclusion can sit on top of a hopeless argument. Keep the two questions separate: does it follow, and are the premises true. Most real disagreements are about the second, and most marks are awarded for noticing the first.
🔧 Ten standard failures
Name
The step that fails
Ad hominem
attacks the arguer instead of the argument
Straw man
refutes a weaker version nobody held
False dilemma
offers two options when more exist
Slippery slope
asserts a chain without defending each link
Circular
the premise restates the conclusion
Hasty generalization
too few or unrepresentative cases
Post hoc
after is treated as because
False equivalence
two unlike things weighed as equal
Survivorship bias
only the cases that lasted were counted
Motte-and-bailey
defends a modest claim, then acts on a bold one
🚫 The fallacy fallacy
Finding a fallacy in an argument tells you the argument fails. It does not tell you the conclusion is false. People give terrible reasons for true claims constantly, and a student who writes “this is a slippery slope, therefore the policy is fine” has committed the very error they were pointing at. The honest sentence is: this argument does not establish the conclusion — which leaves the question open, where it belongs.
🎯 How you will be asked
“Identify the assumption on which the argument depends.”
“Which of the following, if true, most weakens the argument?”
“Evaluate the evidence the writer offers for this claim.”
“Explain the flaw in the reasoning of paragraph four.”
“Does the study support the conclusion drawn from it?”
✅ Before the test, can you…
Separate the premises from the conclusion in a messy paragraph?
State the unwritten warrant a step depends on?
Say whether an argument is valid, sound, both or neither?
Show the failing step rather than just naming the fallacy?
Say why a failed argument leaves the conclusion open rather than false?
Pick your level
Look back at anything you missed — the hint that appeared is exactly what to reread tonight.
How sure did you feel?
Workshop
Work like a reader who tests the join: sort twelve arguments by where they fail, order the diagnosis, label an argument's parts, then show a failing step without committing the fallacy fallacy.
Your practice never leaves this device. There is no account and no sign-in. Your work is saved in this browser only, and you can erase it whenever you want.
Your practice record — saved on this device
This is your record of the module on screen — it stays here and goes nowhere. Independent means you got it right on the first tap; supported means you got it after the explain-and-retry, or marked ‘I had it’ on a revealed answer. Both count, and neither is a grade. If your teacher asks, copy the row or show them this screen.
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Lab
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Explained in own words
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The answer key is for a teacher: it prints only from here, for the unit on screen. Print the study packet prints the study pages and a blank quiz — never the answers.