Why flaw answers feel like a foreign language
Flaw answers are hard not because the flaws are hard, but because the answers are written in abstract, almost legalistic phrasing that hides a simple idea. "Takes for granted that" just means "assumes that" — but on a stressed read it can look like a wall of jargon.
The skill, then, is translation. If you can convert each stock phrase into plain English on sight, flaw questions get dramatically easier, because the underlying errors are ones you already recognize.
This guide decodes the phrases the LSAT recycles, so the wording stops being the obstacle.
'Takes for granted' and 'presumes without warrant' mean 'assumes'
Both phrases mean the argument assumes something it never proved. "Takes for granted that X" and "presumes, without providing justification, that X" are just formal ways to say "the argument assumes X."
So when you see these phrases, plug in the X and ask: does the argument actually need to assume that, and did it leave it unproven? If yes, that's your answer. If the argument did support X, or doesn't rely on X at all, the answer is wrong.
Example: an argument concludes a new tutoring program caused higher test scores, based only on the fact that scores rose after it launched. A correct flaw answer might read "takes for granted that no other factor contributed to the rise in scores" — i.e., it assumes there was no alternative cause.
'Fails to consider' and 'overlooks the possibility' point to a gap
These phrases say the argument ignored something that, if true, would undermine it. "Fails to consider that Y" means the author didn't rule out Y, and Y matters.
The test for these answers: take the Y the answer names and ask whether it would actually damage the argument. A real flaw answer names a possibility the argument needed to address; a wrong one names something irrelevant that wouldn't change the conclusion even if true.
Example: "concludes the policy will reduce traffic but fails to consider that the new policy may push traffic onto nearby streets." If that's a live possibility the argument ignored, the answer correctly describes the gap.
A translation table for common flaw phrases
Here's a quick reference for the abstract phrasing the LSAT reuses and what each one is really saying:
| What the answer says | What it actually means |
|---|---|
| Takes for granted that / presumes without warrant | Assumes something it never proved |
| Fails to consider / overlooks the possibility that | Ignores an alternative that would hurt the conclusion |
| Treats a condition that is sufficient as if it were necessary | Confuses what guarantees a result with what's required for it |
| Mistakes a correlation for a causal relationship | Two things happen together, so it claims one caused the other |
| Draws a conclusion about all members from a claim about some / a part | Part-to-whole leap (or some-to-all) |
| Relies on a sample unlikely to be representative | The evidence group doesn't reflect the group in the conclusion |
| Attacks the source rather than the argument | Ad hominem — criticizes the person, not the reasoning |
Once these become automatic, you'll read a flaw answer and instantly hear the plain-English version underneath it.
How to attack a flaw question
Before you read the answers, name the flaw in your own words. Find the conclusion, find the evidence, and ask: what did the author assume to get from one to the other? You'll usually feel the gap.
Then go to the answers and translate each abstract phrase into plain English, matching it against the gap you found. The correct answer describes the move the argument actually made — not a real-sounding error it didn't commit.
Remember that flaw answers describe reasoning in general terms and usually don't repeat the topic of the stimulus. An answer that mostly restates the argument's content, rather than naming its logical move, is a classic wrong answer.
The common mistake: picking a real flaw the argument didn't make
The most common trap is an answer that describes a genuine logical error — one that simply isn't the error in front of you. Because it names a real flaw, it sounds authoritative, and students pick it out of recognition.
Guard against this by checking that the answer matches this argument. Ask: did the author actually do this? If the answer says "confuses correlation with causation" but the argument made no causal claim, it's wrong no matter how familiar it sounds.
Recognizing a flaw type is not the same as confirming the argument committed it. Always map the abstract phrase back onto the specific stimulus.
Frequently asked questions
What does 'takes for granted' mean on the LSAT?
It means the argument assumes something without proving it. 'Takes for granted that X' is interchangeable with 'assumes X.' To check the answer, confirm the argument actually relies on X and left it unsupported.
What's the difference between 'takes for granted' and 'fails to consider'?
'Takes for granted' points to an assumption the argument needs and didn't prove. 'Fails to consider' points to an alternative possibility the argument ignored that would weaken it. Both name a gap, but one is a hidden premise and the other is an overlooked objection.
Why do correct flaw answers avoid the stimulus's topic?
Flaw answers describe the structure of the reasoning, not its subject. An answer that mainly restates the argument's content usually isn't identifying a logical error. The credited answer names the move — like an unsupported assumption or a part-to-whole leap.
How do I get faster at flaw questions?
Pre-name the flaw in plain English before reading the choices, and practice translating the stock phrases until it's automatic. Speed on flaw questions comes from recognizing the recycled wording instantly, not from reading faster.
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