Parallel reasoning
55 flashcards covering Parallel reasoning for the LSAT Logical Reasoning section.
Parallel reasoning is a type of logical exercise where you identify arguments that share the same underlying structure, even if their topics or details differ. For example, if an argument draws a conclusion based on a specific pattern of evidence, parallel reasoning requires you to spot another argument that uses the exact same logical flow. This concept is essential for developing strong analytical skills, as it trains you to focus on the skeleton of an argument rather than its surface content.
On the LSAT, parallel reasoning questions appear in the Logical Reasoning section, often asking you to select an answer that mirrors the given argument's structure, including any flaws or assumptions. Common traps include choices that seem similar in wording but diverge in logic, so it's crucial to analyze premises, conclusions, and the connections between them. Focus on practicing pattern recognition to avoid distractions from irrelevant details, as these questions test your ability to think abstractly and precisely.
A concrete tip: Diagram the argument's structure early to spot parallels quickly.
Terms (55)
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What is Parallel Reasoning?
Parallel Reasoning questions on the LSAT ask you to select an answer choice that presents an argument with the same logical structure as the one in the stimulus, including the same pattern of reasoning from premises to conclusion.
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Argument Structure in Parallels
The structure of an argument in Parallel Reasoning includes premises that lead to a conclusion, and the correct answer must replicate this exact logical flow without changing the relationships between elements.
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Premises in Parallel Questions
Premises are the supporting statements in an argument that provide evidence or reasons, and in Parallel Reasoning, the answer choice must have premises that function identically to those in the original argument.
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Conclusion in Parallel Questions
The conclusion is the main claim or result drawn from the premises, and for an answer to be parallel, it must draw a similar inference based on comparable supporting evidence.
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Identifying Parallel Structure
To identify parallel structure, compare the logical connections between premises and conclusion in the stimulus to those in the answer choices, ensuring the reasoning pattern matches exactly.
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Common Patterns in Arguments
Parallel Reasoning often involves common patterns like generalization from examples, analogy, or cause-effect, where the answer must use the same pattern as the stimulus.
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Role of Assumptions
Assumptions in Parallel Reasoning are unstated connections between premises and conclusion; the correct answer must rely on similar assumptions without making them explicit.
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Flaws in Parallel Arguments
If the stimulus has a flaw, such as a weak analogy, the parallel answer must exhibit the same flaw in its structure, maintaining the original argument's imperfections.
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Strategy for Parallel Questions
A key strategy is to outline the stimulus argument's core by noting the number and types of premises and how they support the conclusion, then match that to the choices.
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Eliminating Non-Parallel Choices
Eliminate choices that alter the logical flow, such as adding extra premises, changing the conclusion's basis, or reversing the argument's direction.
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Conditional Logic in Parallels
When conditional statements are present, the parallel answer must use the same if-then relationships and logical implications as in the stimulus.
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Analogy in Parallel Reasoning
If the stimulus uses an analogy to support a conclusion, the correct answer must employ a similar analogy with the same comparative structure.
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Causation in Parallels
Arguments involving causation require the parallel answer to link cause and effect in the same way, without introducing alternative explanations.
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Generalization in Parallels
A generalization from specific instances in the stimulus must be mirrored in the answer by drawing a similar broad conclusion from comparable examples.
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Counterexamples in Parallels
If the stimulus uses counterexamples to weaken a claim, the parallel answer should use them in the same manner to challenge a similar assertion.
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Quantifiers in Arguments
Words like 'all,' 'some,' or 'none' affect the scope; parallel answers must use quantifiers that match the stimulus's level of generality.
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Reversing Premises and Conclusion
A common trap is choices that swap the premises and conclusion; these are not parallel because they invert the logical direction.
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Adding Extra Elements
Answer choices that include additional premises or steps not in the stimulus fail to be parallel, as they complicate the original structure.
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Omission of Key Parts
If a choice omits a crucial premise or alters the conclusion's dependency, it does not match the stimulus's argument structure.
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Worked Example: Simple Parallel
In a stimulus where evidence of rain leads to a wet ground conclusion, a parallel answer might use evidence of snow leading to a slippery ground conclusion with the same logic.
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Advanced Parallel with Flaws
For a flawed stimulus generalizing from one case, the parallel answer must generalize from a single instance in the same erroneous way.
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Parallel with Conditional Chains
If the stimulus has a chain like 'If A, then B; if B, then C,' the answer must have an identical chain leading to a similar outcome.
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Distinguishing from Other Question Types
Unlike Strengthen or Weaken questions, Parallel Reasoning focuses solely on matching structure, not evaluating the argument's validity.
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Time-Saving Tip for Parallels
Focus on the abstract form of the argument rather than specifics, as this helps quickly spot matches among answer choices.
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Common Wrong Answer Types
Wrong answers often have similar content but different logic, such as using the opposite reasoning or unrelated premises.
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Parallel in Ethical Arguments
In arguments about ethics, the parallel answer must maintain the same moral reasoning structure, like balancing pros and cons equally.
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Parallel in Scientific Contexts
For scientific arguments, the answer must replicate the experimental logic, such as inferring from data in the same observational pattern.
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Role of Opposing Views
If the stimulus addresses an opposing view, the parallel answer must handle a counterargument in a structurally identical fashion.
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Subtle Differences in Wording
Even minor changes in wording that alter logical connections, like shifting from 'because' to 'despite,' make an answer non-parallel.
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Practice with Real LSAT Examples
Exposing yourself to official LSAT questions helps recognize how parallel structures appear in various contexts, improving pattern recognition.
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Mapping the Argument
Create a mental map of the stimulus, such as 'Premise 1 + Premise 2 leads to Conclusion,' and apply it to evaluate choices.
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Avoiding Content Bias
Do not choose based on familiar or agreeable content; focus solely on the logical framework, regardless of the topic.
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Parallel with Statistical Evidence
If statistics are used in the stimulus to support a claim, the answer must use stats in the same inferential manner.
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Handling Complex Premises
When multiple premises interact, the parallel answer must show the same interactions without simplifying or expanding them.
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Trap of Similar Conclusions
Choices with conclusions that look alike but are supported differently are not parallel, as the premise-conclusion link must match.
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Example: Cause-Effect Parallel
Stimulus: Heavy traffic causes delays; parallel answer: Frequent rain causes floods, both using a direct cause-effect link.
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Nuance in Analogy Parallels
The analogy's strength and application must be identical; a weaker or stronger analogy in the answer breaks parallelism.
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Parallel in Hypothetical Scenarios
Hypothetical 'if' statements in the stimulus require the answer to use hypotheticals with the same conditional outcomes.
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Overlooking Logical Indicators
Words like 'therefore' or 'since' are indicators; parallel answers must use equivalent indicators in the same positions.
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Advanced: Layered Arguments
In arguments with sub-arguments, the entire layered structure must be replicated in the answer choice.
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Common Mistake: Order of Premises
The sequence of premises can matter; rearranging them in the answer makes it non-parallel if it changes the flow.
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Parallel with Disjunctions
If the stimulus uses 'or' statements, the answer must employ disjunctions in the same logical context.
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Strategy for Time-Pressed Tests
Prioritize choices that quickly match the stimulus's premise count and conclusion type to save time.
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Example: Generalization Parallel
Stimulus: Two birds can fly, so all birds can fly; parallel answer: Two cars are red, so all cars are red, both generalizing from limited samples.
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Distinguishing Parallel Flaw
Parallel Flaw questions require the same flawed structure, differing from standard Parallel by emphasizing the error.
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Role of Evidence Strength
The relative strength of evidence in the stimulus must be mirrored; weak evidence in one means weak evidence in the parallel.
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Avoiding Personal Bias in Choices
Select based on structure alone, not whether you agree with the argument's content or implications.
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Parallel in Policy Arguments
For arguments about policies, the answer must use the same reasoning, like weighing costs and benefits identically.
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Nuance: Implicit Premises
If premises are implied, the parallel answer must imply them in the same way without stating them outright.
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Worked Example: Analogy Failure
Stimulus: Comparing apples to oranges as fruits; non-parallel if answer compares apples to cars, lacking the same category.
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Comprehensive Review Tip
After practicing, review why certain choices weren't parallel to reinforce understanding of structural elements.
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Parallel with Counterfactuals
If the stimulus uses 'what if' scenarios, the answer must construct counterfactuals with identical hypothetical logic.
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Trap: Superficial Similarities
Choices that share keywords but differ in logic are traps; always verify the underlying structure.
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Advanced: Intertwined Logic
When logic intertwines multiple elements, like a combination of analogy and causation, the answer must weave them similarly.
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Final Check for Parallels
Before selecting, double-check that every part of the answer's argument corresponds directly to the stimulus's.