GMAT Critical Reasoning: Weaken, Strengthen, and Assumption Patterns

Understanding the Logic Chain

In GMAT Critical Reasoning, every argument can be broken down into evidence, conclusion, and an underlying assumption. The logic chain method involves visually mapping these components to see how the evidence connects to the conclusion. By identifying the unstated assumption—the gap between evidence and conclusion—you can more easily spot what would weaken or strengthen the argument.

For weaken questions, you look for the point where the assumption fails. For strengthen questions, you seek additional support for that assumption. For assumption questions, you explicitly name the missing premise that must be true for the conclusion to hold.

Weaken Questions

Weaken questions ask you to find a statement that makes the conclusion less likely to follow from the evidence. The key is to attack the assumption—show that it may not hold, or that another factor could undermine the link between evidence and conclusion.

Strengthen Questions

Strengthen questions ask for a statement that makes the conclusion more likely. This often involves providing a supporting detail that confirms the assumption or eliminates a potential flaw.

Assumption Questions

Assumption questions require you to identify the unstated premise that the argument depends on. The correct answer is often a necessary condition—if it were false, the conclusion would collapse. Using a logic chain helps you pinpoint the gap between evidence and conclusion and choose the assumption that bridges it.

Applying the Method to Practice

While specific practice questions are not provided here, the framework above can be applied to any GMAT CR passage. Start by mapping the evidence and conclusion, then ask what is missing. Practice with real questions to internalize the patterns.