Weaken an
Argument

Master the art of identifying flaws in reasoning and finding the evidence that undermines a conclusion.

GRE Verbal

What Is an Argument?

In critical reasoning, an argument is not a dispute. It is a structured set of statements: one or more premises that support a conclusion. Every GRE "weaken" question asks you to find the answer choice that makes the conclusion less likely to be true.

Premise

A fact, evidence, or observation presented as true. You accept these at face value.

Assumption

An unstated belief that connects the premise to the conclusion. This is the gap you target.

Conclusion

The claim the author is trying to prove. This is what you weaken.

The Anatomy of an Argument

Why Weakening Matters on the GRE

"Weaken" questions are among the most common question types in GRE Verbal Reasoning. They test your ability to think critically about logical connections rather than simply recalling facts.

Frequency

Appears in nearly every GRE Verbal section, often 2-3 times per test.

Transferable

The same reasoning skills apply to "strengthen," "evaluate," and "flaw" questions.

The Core Rule for Weakening

Common Argument Patterns

1

Causal: "X happened, so X must have caused Y." Weaken by showing an alternative cause for Y.

2

Analogy: "A is like B, so what's true of A is true of B." Weaken by showing a relevant difference between A and B.

3

Statistical / Survey: "This sample shows X." Weaken by showing the sample is unrepresentative.

4

Plan / Proposal: "Doing X will achieve Y." Weaken by showing X has an unintended consequence that undermines Y.

Weaken vs. Strengthen

	Weaken	Strengthen
Goal	Make conclusion less likely	Make conclusion more likely
Target	Attack the assumption	Support the assumption
New evidence	Introduces a gap or counter	Introduces a bridge or confirmation
Premises	Remain unchallenged	Remain unchallenged
Degree	Doesn't need to disprove	Doesn't need to prove

Step-by-Step Approach

1

Find the conclusion. Look for signal words: "therefore," "thus," "so," "consequently," "it follows that."

2

Identify the premises. What evidence is given? What facts support the claim?

3

Spot the gap. What must be true for the premises to lead to the conclusion? This unspoken bridge is the assumption.

4

Predict before reading choices. Ask: "What new fact would break this bridge?"

5

Evaluate each choice. Ask: "If this were true, would the conclusion be less certain?" Pick the strongest weakener.

Worked Example: Causal Argument

Worked Example: Analogy Argument

P

Premise: Company A profited from remote work.

A

Assumption: Companies A and B are similar enough that what works for A will work for B.

C

Conclusion: Company B should switch to remote work.

Worked Example: Plan/Proposal

Recognizing Signal Words

Quickly identify the conclusion and premises by looking for these linguistic cues in the passage.

Conclusion Signals

therefore, thus, hence, so, consequently, it follows that, clearly, must be

Premise Signals

because, since, given that, due to, as evidenced by, studies show

Eliminating Wrong Answers

1

Irrelevant: The choice discusses a topic unrelated to the specific premise-conclusion link. Eliminate it.

2

Strengthener: The choice actually supports the conclusion. It's the opposite of what you need.

3

Too extreme: Choices that say "always," "never," or "impossible" are usually too strong to be correct weakeners.

4

Attacks the premise: The choice disputes a stated fact rather than the logical connection. Premises are given as true.

Common Mistakes

✕ Confusing Weaken with Disprove

You don't need to destroy the argument. A weakener just makes the conclusion less likely, even slightly.

✕ Picking the Strengthener

Under time pressure, students often pick a choice that supports the argument. Always re-check the question stem.

✕ Choosing Based on Emotion

A choice may feel wrong morally, but that doesn't mean it logically weakens the argument. Stay objective.

Summary of Weakening Strategies

Argument Type	Assumption	How to Weaken
Causal	X caused Y (no other cause)	Show an alternative cause
Analogy	A and B are similar enough	Show a relevant difference
Statistical	Sample represents the whole	Show sample is biased
Plan/Proposal	Plan will achieve the goal	Show unintended consequence
Generalization	What's true of part is true of all	Show a counter-example

Question 1 of 5

"A recent study found that employees who take a 20-minute nap during the workday are 15% more productive than those who do not. Therefore, a company seeking to increase worker productivity should allow all employees to take afternoon naps."

▼ Tap to read passage

Which of the following, if true, most weakens the argument?

The study's participants were self-selected: people who choose to nap may already be healthier sleepers and thus more productive regardless. This is a sample bias that undermines the causal claim that napping itself caused the productivity increase.

Question 2 of 5

"The town of Greenfield banned plastic bags last year, and since then the amount of litter in local parks has decreased by 40%. The ban on plastic bags is clearly responsible for this improvement."

▼ Tap to read passage

Which of the following, if true, most weakens the argument?

This is a causal argument. The correct weakener provides an alternative cause: the tripled cleanup crew and new trash cans could easily explain the 40% decrease, regardless of the bag ban. Choice (D) actually strengthens the argument.

Question 3 of 5

"School X raised test scores dramatically after implementing a new math curriculum. School Y, which has similar demographics, should adopt the same curriculum to improve its test scores."

▼ Tap to read passage

Which of the following, if true, most weakens this recommendation?

This is an analogy argument: what worked at X should work at Y. The weakener shows a relevant difference: School X's improvement may be due to the tutors, not the curriculum alone. Since School Y cannot hire tutors, adopting only the curriculum may not yield the same results.

Question 4 of 5

"A survey of 500 frequent flyers found that 80% prefer airline A over airline B. Therefore, airline A is the most popular airline among all travelers."

▼ Tap to read passage

Which of the following, if true, most weakens the conclusion?

This is a statistical/survey argument. The weakener shows the sample is unrepresentative: frequent flyers are a tiny, specialized group whose preferences don't reflect those of all travelers. The conclusion over-generalizes from a biased sample.

Question 5 of 5

"To reduce childhood obesity, the school board has decided to remove all vending machines that sell sugary drinks. Without access to these drinks at school, children will consume fewer sugary beverages overall."

▼ Tap to read passage

Which of the following, if true, most weakens the argument?

This is a plan/proposal argument. The weakener reveals an unintended consequence: children will simply buy sugary drinks elsewhere, and may even buy more. The plan fails to achieve its goal because it only addresses one access point while another remains open and may compensate.

Weaken anArgument

What Is an Argument?

The Anatomy of an Argument

Why Weakening Matters on the GRE

The Core Rule for Weakening

Common Argument Patterns

Weaken vs. Strengthen

Step-by-Step Approach

Worked Example: Causal Argument

Worked Example: Analogy Argument

Worked Example: Plan/Proposal

Recognizing Signal Words

Eliminating Wrong Answers

Common Mistakes

Summary of Weakening Strategies

Question 1 of 5

Question 2 of 5

Question 3 of 5

Question 4 of 5

Question 5 of 5

Weaken an
Argument