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What do Weaken Questions look like?

Weaken questions ask you to identify possible gaps between the evidence presented in a stimulus and the conclusion drawn, and then widen those gaps by adding new evidence. The answer choice will present a fact that makes it less likely for the conclusion to be accurate. However, it does not have to make it absolutely certain that the conclusion is incorrect. If I said that eating a donut every morning will make you gain weight because donuts are high in saturated fat and carbohydrates, you could weaken my conclusion by citing a study showing that people who eat donuts have more energy and do more exercise than people who don’t. That doesn’t prove that eating donuts won’t lead to weight gain, but it supports the idea that eating donuts might actually lead to weight loss.

Check out the post LSAT Logical Reasoning Weaken Questions for a more detailed overview of this question type and how to approach it, or visit our Logical Reasoning Library for tons of information on this section of the exam.

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Below is a list of some of the common ways in which a Weaken question can be phrased. If you’ve seen one that isn’t on this list, please leave it in a comment so we can include it.

  • Which one of the following, if true, would most weaken the logic of the argument?
  • Which one of the following, if true, most seriously calls into questions the conclusion of the argument?
  • Which of the following, if true, most seriously undermines the reasoning in the argument?
  • Which of the following, if true, would provide evidence against the conclusion?
  • Each of the following, if true, directly undermines the claim that [something is true] EXCEPT…

Most Weaken questions will have the phrase “if true” in the prompt, along with some form of the word “weaken” or “undermine”. However, there are a number of less common forms that appear. With Weaken questions, the trick is to identify that the question is asking you to provide a piece of information that is not explicitly stated, but that calls attention to any gaps between the evidence and the conclusion.

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