LSAT Logical Reasoning

Master the art of analyzing, evaluating, and constructing arguments for the LSAT and beyond.

Basic Concepts

Understanding Arguments

What is an Argument?

An argument is a set of statements where some are presented as reasons (premises) for accepting another statement (the conclusion). Arguments are everywhere: in debates, articles, advertisements, and, of course, on the LSAT!

Structure of an Argument

  • Premises: The supporting statements or evidence.
  • Conclusion: The main point or claim being supported.
  • Assumptions: Unstated beliefs or facts needed for the premises to support the conclusion.

Spotting Arguments

Look for indicator words like "because," "therefore," "thus," or "since." These often signal where a premise or conclusion is located.

Why Arguments Matter on the LSAT

Almost every logical reasoning question is built around an argument. Recognizing its structure is the first step to mastering the section.

Examples

  • A news article claims, 'The city should build more parks because green spaces improve mental health.' Here, the premise is that green spaces improve mental health, and the conclusion is that the city should build more parks.

  • 'Since all students passed the test, the teacher must have prepared them well.' The premise is that all students passed; the conclusion is that the teacher prepared them well.

In a Nutshell

Arguments are made of premises and a conclusion; the LSAT tests your ability to spot and analyze them.

Key Terms

Premise
A statement in an argument that provides support.
Conclusion
A statement in an argument that the premises support.
Assumption
An unstated idea necessary for the argument to work.