**GMAT Focus Edition: Critical Reasoning – Argument Structure**

GMAT Focus Edition: Critical Reasoning – Argument Structure

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What This Is

Argument Structure questions test your ability to identify the logical components of an argument—premise, conclusion, assumption, counterpoint, or inference—and how they relate. The GMAT tests this because business decisions require dissecting arguments to spot flaws, gaps, or unstated assumptions. Mastering this skill boosts your Verbal score by 50+ points by eliminating wrong answers that misrepresent the argument’s logic.

Example (GMAT-style):
Editorial: The city’s new bike lanes have reduced traffic congestion. Studies show that bike lane usage increased by 30% last year, while car traffic decreased by 10%. Therefore, the bike lanes are the primary cause of the traffic reduction.

Question: Which of the following best describes the role of the statement “Studies show that bike lane usage increased by 30% last year, while car traffic decreased by 10%” in the argument? (A) It is the main conclusion.
(B) It is evidence supporting the conclusion.
(C) It is an assumption required by the conclusion.
(D) It is a counterpoint to the conclusion.
(E) It is an inference drawn from the conclusion.

(Correct answer: B – The statement is evidence (premise) used to support the conclusion that bike lanes caused the traffic reduction.)

Key Concepts & Techniques

1. Premise vs. Conclusion
2. Premise: A fact, statistic, or claim used to support a conclusion. Look for words like “because,” “since,” “studies show,” or “data indicates.”
3. Conclusion: The main point the argument is trying to prove. Look for words like “therefore,” “thus,” “hence,” or “clearly.”

4. When to use: Identify these first in every argument. The conclusion is what the question will ask you to strengthen, weaken, or evaluate.

5. Assumption (Unstated Premise)

6. A missing link between the premise and conclusion. The argument depends on it but doesn’t state it.

7. When to use: In Strengthen/Weaken or Assumption questions. Ask: “What must be true for the conclusion to hold?”

8. Counterpoint (Opposing View)

9. A statement that contradicts or challenges the main argument.

10. When to use: In Method of Reasoning or Evaluate questions. Spot phrases like “some argue,” “critics claim,” or “however.”

11. Inference (Logical Deduction)

12. A must-be-true statement derived from the premises. Not the main point, but a necessary consequence.

13. When to use: In Inference questions. The answer must follow from the given information—no outside assumptions.

14. Scope Shift (Logical Gap)

15. When the argument moves from one idea to another without justification (e.g., “bike lanes increased → traffic decreased” skips the step “bike lanes caused the traffic decrease”).

16. When to use: In Weaken or Flaw questions. The correct answer will exploit this gap.

17. Method of Reasoning (Argument Structure)

18. Describes how the argument is built (e.g., “uses analogy,” “cites authority,” “attacks a counterargument”).
19. When to use: In Method of Reasoning questions. Focus on structure, not content.

Step-by-Step Strategy

Follow this process for every Argument Structure question:

1. Read the question stem first.
2. Identify the task: Is it asking for the role of a statement? The method of reasoning? An assumption?

3. Example: “The statement ‘X’ plays which of the following roles in the argument?” → You’re looking for structural role (premise, conclusion, etc.).

4. Break the argument into parts.

5. Label each sentence:
   • P = Premise (evidence/fact)
   • C = Conclusion (main point)
   • A = Assumption (unstated link)
   • CP = Counterpoint (opposing view)

6. Example:

   
   
   • P: Bike lane usage increased by 30%.
   • P: Car traffic decreased by 10%.
   • C: Therefore, bike lanes caused the traffic reduction.

7. Map the logical flow.

8. Draw arrows to show how premises support the conclusion.

9. Example:

   
   
   • Bike lane usage ↑ + Car traffic ↓ → Bike lanes caused traffic ↓
   • Gap: The argument assumes no other factors caused the traffic decrease.

10. Predict the answer before reading choices.

11. If the question asks for the role of a statement, decide what it is (premise, conclusion, etc.) before looking at options.

12. If it’s a Method of Reasoning question, describe the argument’s structure in your own words.

13. Eliminate wrong answers systematically.

14. Common traps:

    
    
    • Answers that describe a different part of the argument (e.g., calling a premise the conclusion).
    • Answers that add new information (not in the argument).
    • Answers that misrepresent the logic (e.g., saying the argument “proves” something when it only “suggests”).

15. Confirm the best answer.

16. Reread the question and your prediction. Does the answer exactly match the role or method you identified?

Fully Worked Example

Argument:
Politician: Our city’s public transit system is failing. Last year, ridership dropped by 15%, and customer satisfaction surveys show that 60% of riders are dissatisfied. Clearly, the transit authority’s budget must be increased to improve service.

Question: The statement “Last year, ridership dropped by 15%” serves which of the following roles in the politician’s argument? (A) It is the main conclusion of the argument.
(B) It is evidence supporting the conclusion that the transit system is failing.
(C) It is an assumption required for the conclusion that the budget must be increased.
(D) It is a counterpoint to the claim that the transit system is failing.
(E) It is an inference drawn from the conclusion that the budget must be increased.

Step-by-Step Solution:

1. Read the question stem.

2. Task: Identify the role of the statement “ridership dropped by 15%.”

3. Break the argument into parts.

4. P: Ridership dropped by 15%.
5. P: 60% of riders are dissatisfied.
6. C: Therefore, the transit system is failing.

7. C: Therefore, the budget must be increased.

8. Map the logical flow.

9. Ridership ↓ + Dissatisfaction ↑ → Transit system is failing → Budget must ↑

10. Gap: The argument assumes more money will fix the problem (unstated assumption).

11. Predict the answer.

12. “Ridership dropped by 15%” is evidence (premise) supporting the conclusion that the transit system is failing.

13. Eliminate wrong answers.

14. (A) Wrong: The conclusion is “the transit system is failing,” not the ridership drop.
15. (C) Wrong: The ridership drop is not an assumption—it’s stated evidence.
16. (D) Wrong: It’s not a counterpoint; it supports the conclusion.

17. (E) Wrong: It’s not an inference; it’s a premise.

18. Confirm the best answer.

19. (B) matches: The statement is evidence supporting the conclusion.

Answer: B

Common Mistakes

1. Mistake: Confusing premise and conclusion.
2. Why it happens: Students assume the last sentence is always the conclusion.

3. Correct approach: Look for logical support. A conclusion is what the premises prove.

4. Mistake: Treating an assumption as a premise.

5. Why it happens: Students see a plausible idea and assume it’s stated in the argument.

6. Correct approach: An assumption is unstated. If it’s in the argument, it’s a premise.

7. Mistake: Overlooking counterpoints.

8. Why it happens: Students focus only on the main argument and miss opposing views.

9. Correct approach: Scan for contrast words (“however,” “but,” “some argue”).

10. Mistake: Picking answers that sound reasonable but aren’t in the argument.

11. Why it happens: Students use outside knowledge instead of sticking to the text.
12. Correct approach: The answer must be directly supported by the argument.

GMAT Traps & Timing

1. Trap: “Half-right” answers.
2. The test will give an answer that partially describes the argument but is incomplete or misapplied.

3. Example: In the bike lane argument, an answer might say the statement is “evidence” (correct) but mislabel it as supporting the budget increase (wrong—it supports the traffic reduction).

4. Trap: Reversed logic.

5. The answer describes the opposite of the argument’s structure.

6. Example: Calling a counterpoint a premise or vice versa.

7. Timing:

8. Spend 1:30–2:00 per question on Argument Structure.
9. If stuck, eliminate 2–3 wrong answers and guess. Don’t overthink—move on.

Quick Practice

Question 1:
Advertisement: Our new energy drink, TurboCharge, contains 50% more caffeine than leading brands. Studies show that increased caffeine intake improves alertness. Therefore, TurboCharge will make you more alert than other energy drinks.

Which of the following best describes the role of the statement “Studies show that increased caffeine intake improves alertness” in the argument? (A) It is the main conclusion.
(B) It is evidence supporting the conclusion.
(C) It is an assumption required by the conclusion.
(D) It is a counterpoint to the conclusion.
(E) It is an inference drawn from the conclusion.

Answer: B
Explanation: The statement is evidence (premise) used to support the conclusion that TurboCharge will make you more alert.

Last-Minute Cram Sheet

1. Premise = Evidence (supports the conclusion). Look for data, studies, or facts.
2. Conclusion = Main point (what the argument is trying to prove). Look for “therefore,” “thus,” “clearly.”
3. Assumption = Unstated link (must be true for the conclusion to hold).
4. Counterpoint = Opposing view (introduced with “however,” “some argue”).
5. Inference = Must-be-true (follows from the premises, not the main point).
6. Method of Reasoning = How the argument is built (e.g., analogy, authority, counterexample).
7. ⚠️ Trap: Calling a premise a conclusion (or vice versa). Always map the logic.
8. ⚠️ Trap: Answers that add new info (stick to what’s in the argument).
9. ⚠️ Trap: Reversed logic (e.g., saying a counterpoint is a premise).
10. Time budget: 1:30–2:00 per question. Eliminate 2–3 wrong answers and guess if stuck.

Final Tip: On test day, underline the conclusion in every argument. This forces you to identify the structure before reading the question.