VERBAL SECTION  ·  CRITICAL REASONING

Hour 11 of 24
CR – Argument Structure

Master how every GMAT argument is built — so you can dismantle it, strengthen it, or weaken it on command.

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← 24-Hour Crash Course / Verbal Section / Hour 11: CR – Argument Structure

What You'll Learn This Hour

Core Concepts

1. Argument Anatomy

Background
Context / Setup

Neutral facts that set the scene. NOT the argument itself. Cannot be attacked.

"Studies show that…"
Premise(s)
Stated Evidence

Facts or evidence the author uses to support the conclusion. Accepted as true.

"Because… / Since… / Given that…"
Conclusion
The Author's Claim

What the author is arguing. Find this FIRST. Everything else is support for it.

"Therefore… / Thus… / Hence…"
Pro tip: The conclusion is never the last sentence automatically — the author can put it anywhere. Always ask: "What is this person trying to convince me of?"

2. The Assumption — The Unstated Bridge

Every GMAT argument has a logical gap between its premises and its conclusion. The assumption is the unstated belief the author must hold for the argument to work. It is never written in the passage — that is exactly why it matters.

Assumption Formula

Premises + Assumption → Conclusion

Remove the assumption and the argument collapses.

Negation Test

Negate the answer choice. If the argument falls apart, that's the assumption. This is the fastest way to verify your pick.

3. Three GMAT Argument Types & Their Weaknesses

Type Structure Built-In Weakness
Causal A happened → B happened → A caused B Correlation ≠ causation; third cause; reverse causation
Analogy Situation X worked → Situation Y will too X and Y may differ in a key way that changes the outcome
Statistical Data/survey/study → broad conclusion Sample bias, misleading percentages vs. absolute numbers, outdated data

4. Six CR Question Types

A
Assumption
Find the unstated bridge the argument requires
S
Strengthen
Add a fact that makes the conclusion more likely true
W
Weaken
Add a fact that makes the conclusion less likely true
E
Evaluate
Find the question whose answer determines if the argument stands
I
Inference / Must Be True
Find what must follow from the stated facts alone
F
Flaw / Bold-Face
Identify logical errors or roles of highlighted statements

5. The "Conclusion First" Approach

  1. Step 1.Read the question stem first — know what you're hunting before you read the passage.
  2. Step 2.Read the passage and identify the conclusion immediately. Mark it mentally or on your scratch pad.
  3. Step 3.Label each sentence: Background (B), Premise (P), or Conclusion (C).
  4. Step 4.Pre-phrase the answer — what would a correct answer look like? Do this before you open the choices.
  5. Step 5.Scan answer choices and eliminate aggressively: wrong scope, irrelevant topic, opposite direction.

Argument Structure — Visual Maps

The Argument Bridge

Premises (Stated Evidence) P1, P2, P3… Assumption (Unstated Bridge) Never written in the passage Conclusion (Author's Claim) Find this FIRST Accepted as true Must hold for argument to work Everything supports this

Causal Argument — And Where It Can Break

Event A e.g. Coffee sales rise ? Causal link assumed, not proven Event B e.g. Productivity rises Conclusion: A causes B (Coffee → Productivity) Three ways causal arguments break: 1. Third cause (cold weather) 2. Reverse causation (B→A) 3. Mere coincidence / correlation

Worked Examples — Fully Solved

Example 1 Identify Conclusion
"The city of Harlow has seen a 25% increase in bicycle theft over the past year. The city recently expanded its public transit system. Therefore, the expansion of public transit must have caused the increase in bicycle theft."
Step 1 — Label each part:
  • [P1] 25% increase in bicycle theft over the past year.
  • [P2] The city recently expanded its public transit system.
  • [C] The transit expansion caused the increase in bicycle theft.
Step 2 — Identify argument type: Causal — two correlated events, one blamed for causing the other.
Step 3 — Find the assumption: The transit expansion is the only plausible explanation for rising theft; no other factor explains it. Also: correlation equals causation.
Key Insight: The argument never explains why transit expansion would cause bicycle theft. A weaken answer might note that bike theft also rose in cities with no transit expansion — destroying the causal link.
Example 2 Find the Assumption
"Valleybrook University introduced mandatory yoga sessions for first-year students last semester. This semester, first-year students report 30% lower stress levels than last year's cohort. The university should expand the program to all students."
Step 1 — Label each part:
  • [P1] Mandatory yoga introduced last semester.
  • [P2] This semester's first-years report 30% lower stress.
  • [C] Expand the program to all students.
The Logical Gap: The premises show yoga was introduced and stress fell — they don't prove yoga caused the drop. Nor do they show that older students have similar stress patterns.
Core Assumptions (must all be true):
  • The yoga program — not some other factor — caused the stress reduction.
  • What worked for first-years will also work for upper-year students (analogy assumption embedded).
  • No significant negative side effects accompany the program.
Negation Test Applied: Negate assumption 1: "The yoga program did NOT cause the stress reduction." If true, the entire argument collapses — confirming it is a required assumption.
Example 3 Statistical Argument
"A survey of 200 employees at TechNova found that 78% prefer remote work. TechNova should therefore eliminate its office space, since most employees would rather work from home."
Labels: [P] 78% of 200 surveyed employees prefer remote work. [C] TechNova should eliminate its office space.
Statistical traps in this argument:
  • Sample bias: Were the 200 employees representative of all staff, or only remote-friendly roles?
  • Preference ≠ productivity: Preferring remote work doesn't mean the company is better off without offices.
  • Extreme conclusion: "Eliminate all office space" is much stronger than the data supports; the data suggests "many prefer remote."
GMAT Insight: Watch for conclusions that are more extreme than the evidence. If the data says "78% prefer" and the conclusion says "eliminate all offices," there is a massive gap the GMAT will exploit.

GMAT Traps to Avoid

!
Confusing Premise with Conclusion

Just because a statement comes last does not make it the conclusion. Look for conclusion indicator words (therefore, thus, hence, consequently) and ask "Is the author claiming this, or using it as support?"

!
Thinking Some Arguments Have No Assumption

Every single GMAT argument has at least one assumption. If you can't find one, you haven't looked carefully enough. The assumption is simply the gap between what is stated and what is concluded.

!
Reading Answer Choices Before Pre-Phrasing

GMAT answer choices are crafted to distract. Researchers show that pre-phrasing before reading choices cuts decision time by ~40% and dramatically reduces trap-answer selection. Always pre-phrase.

!
Treating Outside Information as Premises

CR lives in a closed world. Only what is stated in the passage is a premise. Your real-world knowledge about yoga, transit, or coffee is irrelevant — and using it will consistently lead you to wrong answers.

Practice Questions

12 GMAT-style questions. Try each before revealing the answer.

Question 1 — Identify the Conclusion

"Most top-performing employees at Delta Corp work more than 50 hours per week. Marcus works more than 50 hours per week. Therefore, Marcus is likely a top-performing employee."

What is the conclusion of this argument?

A Most top-performing employees work long hours.
B Delta Corp values hard work above all else.
C Marcus is likely a top-performing employee.
D Marcus works more than 50 hours per week.
E Working long hours causes strong performance.
Show Answer
Correct: C. The word "therefore" signals the conclusion directly. A and D are premises. B and E go beyond what the argument states.

Question 2 — Identify the Assumption

"Ridgewood Hospital began offering free parking to doctors last year. Since then, the average time doctors spend with each patient has increased by 12%. The hospital should offer free parking to all staff to further improve patient care."

The argument above relies on which of the following assumptions?

A Doctors spend more time with patients than nurses do.
B Free parking was the cause of the increased time doctors spend with patients.
C Patient satisfaction scores have also improved since parking became free.
D The hospital has sufficient parking spaces to accommodate all staff.
E Other hospitals have adopted similar free parking policies.
Show Answer
Correct: B. The argument jumps from "free parking introduced → time with patients rose" to "free parking caused the improvement." This causal link is the core assumption. Negate B ("free parking did NOT cause the increase") and the entire argument crumbles. D is tempting but is a secondary concern about feasibility, not a logical necessity for the argument's structure.

Question 3 — Premise vs. Conclusion

"Since organic farming avoids synthetic pesticides, and synthetic pesticides have been linked to groundwater contamination, organic farms are better for the environment than conventional farms."

Which of the following correctly identifies the role of "synthetic pesticides have been linked to groundwater contamination"?

A It is the main conclusion.
B It is background context irrelevant to the conclusion.
C It is a premise supporting the conclusion.
D It is a secondary conclusion derived from an earlier premise.
E It is an assumption the argument relies on but does not state.
Show Answer
Correct: C. This statement is used as evidence (a stated fact) that the author marshals toward the conclusion that organic farms are better. It is stated directly — so it cannot be an assumption (E). The conclusion is the final claim about organic farms being better for the environment.

Question 4 — Causal Gap

"In Westport, ice cream sales and drowning rates both peak in July. City officials concluded that eating ice cream increases the risk of drowning."

Which of the following most seriously weakens the officials' conclusion?

A Ice cream consumption is higher among children than adults in Westport.
B July is the hottest month in Westport, leading more people to both buy ice cream and swim.
C Drowning rates in neighboring towns also peak in July.
D Local ice cream shops have increased their safety messaging about water activities.
E Westport has more swimming pools per capita than any other city in the region.
Show Answer
Correct: B. This introduces a third common cause (hot weather) that independently explains both rising ice cream sales AND rising drowning rates — destroying the causal link between the two. This is the classic "third cause" attack on causal arguments. C is tempting but doesn't address the causal mechanism. E is irrelevant to the causal claim.

Question 5 — Argument Type

"The marketing campaign launched by BrightBrand in the Southern region doubled their sales. BrightBrand should therefore launch the same campaign in the Northern region to achieve similar results."

What type of argument is this, and what is its core weakness?

A Causal; it assumes marketing campaigns always double sales.
B Statistical; the sample of one campaign is too small to generalize.
C Analogy; it assumes the Northern region is similar enough to the Southern region that the same campaign will work.
D Causal; it confuses correlation with causation regarding the campaign's effect.
E Statistical; it fails to account for regional economic differences.
Show Answer
Correct: C. This is an analogy argument — what worked in X should work in Y. The assumption is that the two situations are sufficiently similar. The Northern region may have different demographics, competitors, or brand awareness. D is partially plausible but misidentifies the type; the campaign's effectiveness is accepted as given in the premise.

Question 6 — Find the Gap

"Forty percent of Greenville Elementary students scored below grade level in reading. The school recently replaced its experienced reading teachers with cheaper, less-experienced hires to cut costs. The budget cuts are responsible for the low scores."

The argument's conclusion would be most strengthened by which of the following?

A Similar schools that did not change their reading teachers maintained or improved reading scores.
B The school's math scores also declined over the same period.
C Teacher experience is the most frequently cited factor in student reading achievement.
D Greenville Elementary has a higher percentage of non-native English speakers than comparable schools.
E Budget cuts are common across all schools in the Greenville district.
Show Answer
Correct: A. This directly closes the gap in the causal argument by providing a comparison group. If schools that did NOT make this change maintained scores, it strongly suggests the teacher change caused the decline. B introduces a separate issue. C provides general support but not specific to this case. D actually weakens the argument (alternate explanation). E is irrelevant to this school's situation.

Question 7 — Must Be True / Inference

"All GMAT questions in the Critical Reasoning section test logical reasoning. Some questions that test logical reasoning also test reading comprehension. No question that tests only reading comprehension appears in the Critical Reasoning section."

If the statements above are true, which of the following must be true?

A All questions that test reading comprehension also test logical reasoning.
B Some Critical Reasoning questions may also test reading comprehension.
C Reading comprehension is never tested on the GMAT.
D Logical reasoning questions are harder than reading comprehension questions.
E No Critical Reasoning question tests reading comprehension.
Show Answer
Correct: B. The second statement tells us some logical-reasoning questions also test reading comprehension. Since CR questions all test logical reasoning, some of those CR questions could be among the "some" that also test reading comprehension. This is a valid inference. E is the opposite of what can be inferred. A goes beyond the stated scope — we know only that "some" overlap, not "all."

Question 8 — Identify the Flaw

"Everyone who passed the advanced certification exam studied for at least 100 hours. Priya studied for 120 hours. Therefore, Priya must have passed the advanced certification exam."

The reasoning above is flawed because it:

A Assumes that studying more hours always leads to better performance.
B Confuses a necessary condition (100 hours of study) with a sufficient condition for passing.
C Fails to account for the difficulty of the exam.
D Compares Priya to students who studied fewer hours.
E Overgeneralizes from a sample of one to a population.
Show Answer
Correct: B. The premise says studying 100+ hours is necessary to pass (everyone who passed did so). But the argument treats it as sufficient — as if studying 100+ hours guarantees passing. Many people might study 100+ hours and still fail. This necessary vs. sufficient confusion is one of the most tested GMAT logical flaws.

Question 9 — Causal vs. Correlation

"In cities where umbrella sales are highest, hospital admissions for respiratory illness are also highest. To reduce respiratory illness hospitalizations, city health departments should restrict umbrella sales."

Which of the following best describes the flaw in the argument?

A The recommendation ignores the economic impact on umbrella manufacturers.
B Correlation between umbrella sales and illness rates does not establish that umbrellas cause illness.
C Health departments rarely have the authority to restrict commercial sales.
D The data on umbrella sales may have been collected inaccurately.
E Respiratory illness is caused by viruses, not environmental factors.
Show Answer
Correct: B. Both phenomena (umbrella sales, respiratory illness) are almost certainly caused by a third factor: rainy, cold weather. The argument mistakes correlation for causation. A, C, and D address practical concerns outside the argument's logic. E introduces outside information and is too extreme ("never environmental factors").

Question 10 — Statistical Argument

"A survey of 50 gym members found that 80% believe the gym's new equipment has improved their workout quality. The gym's management concluded that the new equipment is a success."

Which of the following, if true, most undermines the management's conclusion?

A The 50 members surveyed were volunteers who self-selected to answer the survey.
B The gym has 2,000 total members, of which only the most enthusiastic use the new equipment regularly.
C The new equipment cost twice as much as the previous equipment.
D Gym membership has declined by 15% since the new equipment was installed.
E Members who were surveyed had been members for an average of three years.
Show Answer
Correct: D. If membership declined 15% since installation, the equipment may be driving members away — a direct measure of failure that contradicts the "success" conclusion. A introduces sample bias but doesn't directly contradict success. B explains why those surveyed like it but doesn't undermine the result for the whole gym. C is a cost concern, not a question of effectiveness.

Question 11 — Pre-Phrase Practice

"Doctors at Maplewood Clinic who took a mindfulness training course reported higher job satisfaction scores than those who did not. The clinic director plans to require all employees — including administrative staff — to complete the course to boost overall workplace satisfaction."

The plan depends on which of the following assumptions?

A Mindfulness training is inexpensive and easy to administer.
B Administrative staff experience the same sources of job dissatisfaction as doctors.
C Higher job satisfaction leads to better patient outcomes.
D Mindfulness training will be similarly effective for administrative staff as it was for doctors.
E The clinic director has the authority to require all staff to complete training.
Show Answer
Correct: D. This is an analogy argument — what worked for doctors will work for administrative staff. The plan's core assumption is that the training's effect transfers across job roles. Negate D: "Mindfulness training will NOT be similarly effective for admin staff." The plan falls apart. B is a weaker version of this idea. A and E address feasibility, not the logical gap.

Question 12 — Synthesis

"Over the past decade, cities with more green spaces per capita have consistently lower rates of depression among residents. City planners should therefore invest in creating more parks and green spaces to reduce depression rates."

Which of the following, if true, most strengthens the city planners' recommendation?

A City planners in several countries have recently prioritized green space development.
B Longitudinal studies show that individuals who begin using newly created green spaces report lower depression scores within six months.
C Wealthy cities tend to have more green spaces and also tend to have lower depression rates.
D Depression is influenced by many factors including genetics, income, and social connection.
E Some cities with abundant green spaces still report above-average depression rates.
Show Answer
Correct: B. This closes two gaps simultaneously: it establishes causation (green space use → lower depression) and shows the effect happens when new green space is created (not just in cities that happened to be greener). C actually weakens the argument by introducing a confounding variable (wealth). D weakens by suggesting green space is not a primary driver. E weakens by showing exceptions.

Quick Reference Card

# CR Argument Structure — Hour 11 Cheat Sheet
## Argument Components
Background = neutral scene-setting, cannot be attacked
Premise(s) = stated evidence, accepted as true
Conclusion = author's claim, FIND THIS FIRST
## Assumption Formula
Premises + [Assumption] → Conclusion
## Negation Test
1. Negate the answer choice
2. If argument breaks → that IS the assumption ✓
## 3 Argument Types → Weakness
Causal → correlation ≠ causation | third cause | reverse
Analogy → situations may differ in a key way
Statistical → sample bias | % vs absolute | outdated data
## 6 CR Question Types
A Assumption → find the unstated bridge
S Strengthen → add fact making conclusion more likely
W Weaken → add fact making conclusion less likely
E Evaluate → find question whose answer decides it
I Inference/MBT → what MUST follow from stated facts
F Flaw/Bold-Face → ID logical error | role of statement
## Conclusion First — 5-Step Method
1. Read question stem first
2. Find & mark conclusion
3. Label: [B] Background / [P] Premise / [C] Conclusion
4. Pre-phrase expected answer
5. Eliminate aggressively (wrong scope / direction / topic)
## Trap Alert
✗ Last sentence ≠ automatically the conclusion
✗ Every argument HAS an assumption — always
✗ Pre-phrase BEFORE reading choices (saves ~40% time)
✗ Outside knowledge is irrelevant — closed-world reasoning