LSAT (Law School Admission Test) Logical Reasoning: Argument Fundamentals Syllabus

Logical Reasoning: Argument Fundamentals syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Logical Reasoning: Argument Fundamentals in LSAT (Law School Admission Test), not a summary of it.

1. 1

   Argument Structure and Components

   4 topics

   • Identifying conclusions and premises
     • Main conclusion vs. subsidiary conclusion
     • Conclusion and premise indicator words
     • Conclusions without indicators
   • Background information and context
   • Counterpremises and concessions
   • Distinguishing argument from mere assertion
2. 2

   Assumptions and the Logical Gap

   4 topics

   • Necessary vs. sufficient assumptions
     • The negation test for necessary assumptions
     • Filling the gap with sufficient assumptions
   • Identifying the gap between premise and conclusion
   • Supplier vs. defender assumptions
   • Common assumption types in everyday arguments
3. 3

   Common Logical Flaws and Fallacies

   7 topics

   • Causation and correlation errors
     • Confusing correlation with causation
     • Reversed causation
     • Overlooked alternative causes
   • Conditional reasoning errors
     • Mistaken negation (denying the antecedent)
     • Mistaken reversal (affirming the consequent)
   • Sampling and representativeness flaws
     • Unrepresentative samples
     • Hasty generalization
   • Comparison and analogy flaws
     • False analogy
     • Equivocation and shifting terms
   • Ad hominem and source attacks
   • Circular reasoning and begging the question
   • Part-to-whole and whole-to-part errors
4. 4

   Formal and Conditional Logic

   4 topics

   • Conditional statements and notation
     • If-then translation
     • Sufficient and necessary conditions
     • Contrapositive
   • Logical operators and indicators
     • Only, only if, unless, until
     • And, or, and their negations
     • Quantifiers: all, some, most, none
   • Chaining conditional statements
   • Valid vs. invalid inference patterns

Logical Reasoning: Argument Fundamentals flashcards for LSAT (Law School Admission Test)

20 of 53 cards from the Logical Reasoning: Argument Fundamentals deck — real questions with worked answers.

1. In LSAT logical reasoning, what is the conclusion of an argument?

   The main claim the author is trying to prove or get you to accept; everything else in the argument exists to support it. It is the point the rest of the argument leads to, not necessarily the last sentence.

2. In LSAT logical reasoning, what is a premise?

   A statement offered as evidence or support for the conclusion. Premises are the reasons given to make the conclusion believable; they answer 'why should I accept the conclusion?'

3. Name three common premise (evidence) indicator words on the LSAT.

   'Because,' 'since,' 'for,' 'given that,' 'as,' 'after all,' 'for the reason that.' Statements following these words are usually premises.

4. Name three common conclusion indicator words on the LSAT.

   'Therefore,' 'thus,' 'hence,' 'so,' 'consequently,' 'it follows that,' 'as a result,' 'clearly,' 'must.' Statements following these are usually the conclusion.

5. What is the 'Conclusion Test' (Therefore Test) for separating premise from conclusion?

   Insert 'therefore' before each candidate statement. The statement that logically follows from the others—the one the rest support—is the conclusion. If 'because' fits better, it is a premise.

6. What is a subsidiary (intermediate) conclusion in an argument?

   A claim that is supported by a premise but in turn supports the main conclusion. It functions as both a conclusion (of a sub-argument) and a premise (for the main conclusion).

7. On the LSAT, what role does background information play in an argument?

   It provides context or sets up the situation but is neither the conclusion nor direct support for it. It helps the reader understand the topic but is not load-bearing evidence.

8. How can you distinguish background information from a premise?

   Remove the statement: if the support for the conclusion is unaffected, it was background/context. A premise, if removed, weakens the logical support for the conclusion.

9. What is a counterpremise (counterconsideration) in an LSAT argument?

   A point that runs against the author's conclusion, which the author acknowledges but argues is outweighed by their evidence. It is often signaled by contrast words like 'although,' 'even though,' 'while,' or 'despite.'

10. What is a concession in an argument, and how is it signaled?

    A concession is an admission that an opposing point has some merit, made before the author asserts their own view. It is signaled by words like 'admittedly,' 'granted,' 'of course,' 'while it is true that,' or 'although.'

11. After an 'although/while' concession clause, where is the author's actual conclusion usually found?

    In the main (independent) clause that follows the concession. The concession sets up a contrast; the author's real position comes after it, often with a 'but/yet/however.'

12. What distinguishes a genuine argument from a mere assertion on the LSAT?

    An argument offers at least one premise as support for a conclusion (a reasoning structure). A mere assertion is a claim stated without supporting evidence—an opinion with no premises backing it.

13. Why does identifying whether a passage is an argument or a set of assertions matter for LSAT questions?

    Many question types (assumption, flaw, strengthen/weaken) require a premise-to-conclusion structure to attack. If there is no reasoning, there is no gap or assumption to evaluate—only a description or report.

14. Define a sufficient assumption on the LSAT.

    An assumption that, if added to the premises, is ENOUGH to guarantee the conclusion follows—it makes the argument logically valid. It can be 'more than necessary'; it just has to seal the gap.

15. Define a necessary assumption on the LSAT.

    An assumption the argument REQUIRES to be true in order to work; if it were false, the argument would fall apart. It is something the author must be taking for granted, even if it does not by itself prove the conclusion.

16. What is the Negation Test, and which assumption type does it apply to?

    It tests necessary assumptions: negate the answer choice; if the negation destroys (makes impossible) the argument, the choice is a necessary assumption. If the argument survives negation, it is not necessary.

17. Contrast sufficient vs. necessary assumptions in terms of strength of answer choices.

    Sufficient assumption answers are often strong/absolute (they must fully bridge the gap and can say more than needed). Necessary assumption answers are typically weaker/minimal—just enough that the argument depends on them; overly strong choices often fail necessary-assumption questions.

18. What is the 'gap' between premise and conclusion in an LSAT argument?

    The logical leap or new idea introduced in the conclusion that is not fully established by the premises—often a shift in concept, scope, or terms. Assumptions exist to fill this gap.

19. What is a 'term shift' (concept shift) that creates a gap?

    When the conclusion uses a term or concept not present in (or not equivalent to) the one in the premises—e.g., premise about 'popular' but conclusion about 'high quality.' The assumption links the two terms.

20. What is a supplier (supporter) assumption?

    An assumption that builds a bridge by connecting a new term in the premises to a new term in the conclusion—it actively supplies the missing link the argument needs.

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