GMAT Critical Reasoning: Weakening, Strengthening, and Assumption Strategies

Understanding the Logic Chain

In GMAT Critical Reasoning, many arguments follow a similar structure: evidence leads to a conclusion. The logic chain method involves identifying the conclusion, the evidence, and the assumption that connects them. By breaking down an argument into these parts, you can more clearly see what would weaken or strengthen it.

Weakening Questions

To weaken an argument, you need to attack the link between the evidence and the conclusion. This often means showing that the assumption is flawed or that other factors could explain the result. For example, if a study shows that people who drink coffee have fewer heart attacks, a weakening statement might point out that coffee drinkers also exercise more. That introduces an alternative explanation, undermining the causal claim.

Strengthening Questions

Strengthening questions require you to support the connection between evidence and conclusion. This can be done by ruling out alternative explanations or by providing additional evidence that makes the conclusion more likely. For instance, if an argument claims that a new teaching method improves test scores, a strengthening statement might show that schools using the method had similar student backgrounds to those that did not, thus isolating the method as the key variable.

Assumption Questions

Assumption questions ask you to identify the unstated premise that must be true for the argument to hold. The assumption is necessary for the conclusion to follow from the evidence. For example, if a company argues that increasing advertising will increase sales, an assumption might be that the company's product is not already at saturation point in the market. If that assumption is false, the argument falls apart.

Applying the Logic Chain

When you encounter a Critical Reasoning question, first read the argument and identify its conclusion. Then, find the evidence that supports it. Finally, consider what must be true for that evidence to lead logically to the conclusion. This chain helps you determine which answer choice weakens, strengthens, or is necessary to the argument. Practice with real GMAT questions to become comfortable with this method.

For more detailed guidance, see our articles on GMAT Critical Reasoning: Weakening, Strengthening, and Assumption Questions and GMAT Critical Reasoning: Weakening, Strengthening, and Assumption Strategies.