Study Guide

Build the foundational vocabulary and four-step systematic approach for tackling every Logical Reasoning question. Learn to identify question types, untangle stimuli, predict answers, and evaluate choices.

Master the two core components of every LSAT argument: the conclusion and the evidence. Learn to use conclusion keywords, identify subsidiary conclusions, and distinguish the argument core from peripheral information. Covers the full taxonomy of objective question types (Main Point, Role of Statement, Method of Argument, Point at Issue, Parallel Reasoning) and subjective types (Assumption, Flaw, Strengthen, Weaken). Includes the foundational four-step LR method.

Master the core components of an LSAT argument: main conclusion, premises, intermediate conclusions, and peripheral information. Learn to identify opposing viewpoints, concessions, and background information, and distinguish core from non-core elements. Understand how the same argument can be approached from eight different question-type angles (Main Point, Flaw, Assumption, Strengthen, Weaken, Sufficient Assumption, Necessary Assumption, Parallel Reasoning).

Build fluency in diagramming conditional statements and their contrapositives. Practice translating if-then, unless, only if, and all/no statements into formal logical notation. Master sufficient and necessary conditions through 30 targeted diagramming exercises.

Learn the systematic approach to every Logical Reasoning question: read, identify, preprepare, eliminate.

Master the two types of necessary assumptions: bridge assumptions that connect premises to conclusions by introducing a new concept (e.g., polyphenols → prevent illness), and defender assumptions that protect the argument by eliminating potential objections. Learn to use the negation test to verify assumptions — if negating the answer destroys the argument, it is a necessary assumption. Practice with 33 questions from LR_II_3 (#24-41) and LR_II_5 (#42-54).

Master sufficient assumption questions — those that ask 'which one of the following, if assumed, enables the argument's conclusion to be properly drawn?' The correct answer establishes the conclusion on the basis of the evidence; the four wrong answers will not. Practice distinguishing sufficient from necessary assumptions using the guided step-by-step method (Step 1: identify type → Step 2: analyze argument → Step 3: predict assumption → Step 4: evaluate choices). Practice with 12 questions from LR_II_5 (#42-54).

Develop the critical mindset essential for LSAT Flaw questions. Learn to ask 'Why doesn't the support justify the point?' and describe flaws using precise language. Master the 'fails to consider' and 'takes for granted' frameworks. Practice with 56 flaw questions from LR_II_6a (#55-60), LR_II_6b (#73-80), LR_II_17 (Flaw & Match Flaw), and the mixed review sets.

Master the 19 most frequently tested logical fallacies on the LSAT. From ad hominem and faulty analogy to correlation vs. causation and conditional logic flaws, this comprehensive reference covers every flaw type with examples and recognition strategies.

Find answers that undermine the logical support for the conclusion. Weakening answers attack the argument's assumptions or provide counter-evidence that makes the conclusion less likely to follow. Practice with 17 weaken questions from LR_II_7+8 (#81-92) and the mixed pool (LR_II_c #65-84).

Identify answers that provide additional support for the argument's conclusion. Strengthening answers confirm assumptions, add supporting evidence, or eliminate alternative explanations. Practice with 21 strengthen questions from LR_II_7+8 (#81-92) and the mixed pool (LR_II_c #65-84).

Master questions that require you to derive conclusions from given premises.

Identify arguments with matching logical structure and reasoning patterns. Practice with 1 guided question from LR_6 plus additional parallel reasoning exercises. Key skill: strip the content from both arguments and compare only the abstract logical structure — conclusion type, premise types, and the relationship between them.

Identify and answer Main Point questions by finding the argument's final conclusion. Learn to distinguish the main conclusion from evidence, background information, and subsidiary conclusions using the four-step method. Practice with 5 guided questions (LR_2) plus 30 additional conclusion-identification exercises from LR_I_iv and warm-up drills from LR_I_i and LR_I_iii. Includes the 'Stick to the steps' framework: (1) Understand your job, (2) Find the point, (3) Find the support, (4) Get rid of answers, (5) Confirm the right answer.

Identify how a specific statement functions within an argument. Learn to classify statements as main conclusions, subsidiary conclusions, premises, background information, potential objections, or counterexamples. Practice with 4 guided questions from LR_3 plus 6 additional Role questions from the LR_I_a review set. Key skill: distinguishing a subsidiary conclusion (which supports the main conclusion) from a premise (which supports the subsidiary conclusion).

Identify and describe the argumentative strategy an author uses. Learn to recognize techniques such as analogy, example, counterexample, appeal to authority, elimination of alternatives, and challenging a premise. Practice with 4 guided questions from LR_4 plus 9 additional Method questions from LR_I_a and LR_I_b review sets. Key distinction: Method questions ask HOW the argument is made, not WHAT the conclusion is.

Pinpoint the specific issue on which two speakers disagree. Learn to use the Point at Issue Tree to systematically identify the exact claim one speaker affirms and the other denies. Practice with 3 guided questions from LR_5 plus 4 additional Point at Issue questions from the LR_I_b review set. Key test: the correct answer must be something Speaker A would say YES to and Speaker B would say NO to (or vice versa).

Apply general principles to specific situations and identify underlying rules.

Resolve the Paradox (also called Explain the Discrepancy) questions present two facts that seem contradictory and ask you to find the answer choice that explains how both can be true simultaneously. The correct answer introduces new information that makes both statements compatible — it does NOT eliminate one fact or simply restate the paradox. The four-step approach: (1) identify the two seemingly contradictory facts, (2) articulate exactly what makes them surprising together, (3) predict the type of information that would reconcile them, (4) select the answer that allows both facts to coexist. Common wrong answer patterns: answers that explain only one side of the paradox, answers that deepen the contradiction, answers that are irrelevant to the specific discrepancy, and answers that use extreme or absolute language. Source: LR Logical Reasoning by Type, Volume 3 (pp. 257–275), 71 questions.

Master the four elements of RC reasoning structure: Main Points (why the passage was written), Reasons For and Against (supporting/opposing evidence), Background (contextual information), and Information & Application (results or usage of main points). RC passages may have 1–3 main points — unlike LR which has one. As you read, ask: 'Why did the author write this?' Author's view is often one of the main points. Includes the two-pass reading strategy from RC_22: first pass for main points and author's view, second pass for structural roles.

Master the full taxonomy of RC question types and their wrong answer patterns. Eight question types: Main Idea, Detail, Inference, Author's Opinion, Structure, Analogy, Vocabulary in Context, and Comparative. Wrong answer patterns include: Too Broad/Too Narrow, Outside the Scope, Extreme Language, Opposite Direction, Half Right/Half Wrong, and Distortion. Includes the RC_35 Questions in Categories Drill Set (2 full passages from PT 29 and PT 31) and the RC_40 Passage Types & Question Types Practice Set.

Identify the primary argument and overall organizational structure of passages. Main Idea questions ask for the passage's central claim or purpose — the answer must be neither too broad nor too narrow. Structure questions ask about the author's purpose or how a specific component functions in the passage. Key skill: distinguish the main point from supporting evidence, background, and application. Includes 5 Main Idea questions and 4 Structure questions from RC_35 and RC_38.

Draw valid inferences from passage content without overextending, and locate specific details accurately. Inference questions ask what can be concluded or what the author would most likely agree with — the correct answer must be directly supported by the passage. Detail questions ask what the passage states according to the author. Key pitfall: confusing what the passage implies with what it explicitly states. Includes 5 Inference questions and 10 Detail questions from RC_35 and RC_38.

Discern the author's perspective and attitude, identify analogous situations, and handle comparative passage questions. Author's Opinion questions ask what the author believes or would agree with — the author's view is often embedded in word choice and emphasis. Analogy questions ask which situation is most closely parallel to something described in the passage. Comparative questions ask about the relationship between two passages or what one author would think about the other. Includes 5 Author's Opinion, 2 Analogy, 1 Comparative, and 3 Vocabulary in Context questions from RC_35 and RC_38.

Master the unique format of comparative RC passages — two shorter passages on the same topic. Learn to identify the relationship between the passages (agreement, disagreement, complementary perspectives, or one responding to the other) and answer questions that require synthesizing both. Includes the RC_25 Comparative Passages lesson and Practice Set II.