LSAT Logical Reasoning: Question Types and How to Attack Them

The recurring question families

Learn the list. Most Logical Reasoning questions fall into a short list of repeating types: identifying a necessary or sufficient assumption, strengthening or weakening an argument, describing a flaw in reasoning, drawing a valid inference from stated facts, matching the logical structure of one argument to another, resolving an apparent paradox, and identifying an argument's main conclusion or method.

Each type asks a genuinely different question even when the passage looks similar. An assumption question asks what the argument needs to be true; an inference question asks what must be true given only what's stated — treating the two the same way is a common source of wrong answers.

• Assumption (necessary and sufficient)
• Strengthen and weaken
• Flaw in the reasoning
• Must-be-true inference
• Parallel reasoning and parallel flaw
• Paradox and resolve/explain
• Main point and method of reasoning

Building an approach per type, not one generic method

Identify the question type first, from the question stem, before reading the argument closely. That single habit changes what you're looking for on the first read and cuts down on rereading.

For assumption and strengthen/weaken questions, separate the argument's premises from its conclusion and look for the logical gap between them — the assumption almost always fills that exact gap. For inference questions, resist any answer that requires an outside assumption: a correct inference follows from the stated facts alone.

Why timing failures usually aren't a speed problem

A candidate who reviews missed questions and finds the same one or two question types recurring has an accuracy problem that looks like a timing problem. Fix the recognition and approach for that type before adding timed drilling, or you will simply get faster at making the same mistake.

Where Logical Reasoning sits in the LSAT's design

According to LSAC, the multiple-choice portion of the LSAT has two scored Logical Reasoning sections and one scored Reading Comprehension section, plus one unscored section that is either Logical Reasoning or Reading Comprehension. Each of the four sections is 35 minutes long. Logical Reasoning therefore accounts for two of the three scored sections, so about two-thirds of the scored testing time is spent on it, by simple arithmetic from those counts.

The unscored section can be Logical Reasoning too, so a test taker cannot tell which Logical Reasoning section, if any, does not count. LSAC says it uses the unscored section to validate new questions for future use, and all questions on scored sections are weighted the same.

What the score rewards

LSAC scores by the number of questions answered correctly, and there is no deduction for wrong answers. That means an answer should be entered for every question in a scored section, and the pacing question is how many minutes each question gets out of a 35-minute section.

The raw score converts to the 120 to 180 scale, and percentiles show the share of test takers who scored lower over the previous three testing years. Because the unscored section can be Logical Reasoning, practice under full, equal effort on every Logical Reasoning section.

What LSAC says Logical Reasoning tests

LSAC describes Logical Reasoning as questions built on short arguments drawn from newspapers, general interest magazines, scholarly publications, advertisements and informal discourse. It says these arguments mirror legal reasoning in the types of argument and their complexity, although few of them are actually about law. Each question asks about one short passage, and LSAC says a passage occasionally carries two questions.

LSAC's own list of the skills tested is recognizing the parts of an argument and their relationships, recognizing similarities and differences between patterns of reasoning, drawing well-supported conclusions, reasoning by analogy, recognizing misunderstandings or points of disagreement, determining how additional evidence affects an argument, detecting assumptions, identifying and applying principles or rules, identifying flaws, and identifying explanations.