Parallel flaw
58 flashcards covering Parallel flaw for the LSAT Logical Reasoning section.
Parallel flaw questions on the LSAT ask you to identify an argument that mirrors the faulty reasoning in a given example. Essentially, you're looking for a passage that commits the same logical error, such as assuming correlation implies causation or making a hasty generalization. This skill is crucial because it tests your ability to analyze argument structures deeply, helping you spot flaws in reasoning that could appear in real-world legal scenarios.
On the LSAT's Logical Reasoning section, these questions often appear as "which one of the following is most like the flawed argument?" types. Common traps include getting distracted by superficial similarities in content rather than focusing on the underlying logical structure, or overlooking subtle differences in the flaw. To succeed, concentrate on breaking down the original argument's components—premises, conclusions, and the specific error—and then match that pattern exactly in the answer choices.
Practice by timing yourself on sample questions to build speed and accuracy.
Terms (58)
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Parallel flaw question
A type of LSAT Logical Reasoning question where you must identify an answer choice that has the same logical flaw as the argument presented in the stimulus.
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Flaw in the stimulus
The error in reasoning within the given argument that you need to recognize and match in parallel flaw questions.
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Logical structure of an argument
The underlying pattern of premises leading to a conclusion, which in parallel flaw questions must be mirrored along with its error.
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Matching the flaw exactly
Requiring the correct answer to replicate not just the argument's form but specifically the same type of reasoning error as in the stimulus.
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Common flaw: Hasty generalization
A frequent error where a conclusion is drawn from a sample that is too small or not representative, often appearing in parallel flaw questions.
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Common flaw: False cause
Assuming that because one event follows another, the first caused the second, a mistake that parallel flaw questions may require you to identify and match.
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Common flaw: Ad hominem
Attacking the person making the argument instead of addressing the argument itself, which could be the flaw to parallel in these questions.
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Common flaw: Circular reasoning
Using the conclusion as a premise, creating a loop that doesn't prove anything, and this structure might need to be matched in parallel flaw tasks.
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Common flaw: Weak analogy
Drawing a comparison between two things that are not sufficiently similar, a flaw that parallel questions often test for replication.
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Common flaw: Appeal to authority
Relying on an expert's opinion without evidence that it applies, which could be the error to identify and match in parallel contexts.
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Abstracting the argument
Simplifying the stimulus to its core logical components, such as premises and conclusion, to better spot the flaw for parallel matching.
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Diagramming for parallel flaws
Using shorthand to map out the argument's structure, helping to compare it accurately to answer choices in parallel flaw questions.
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Premises in flawed arguments
The supporting statements in an argument that, due to the flaw, do not adequately lead to the conclusion and must be mirrored in parallel choices.
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Conclusion in flawed arguments
The final claim in an argument that is unjustified due to the flaw, requiring exact replication in the correct parallel answer.
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Role of assumptions in flaws
Unstated beliefs that the argument relies on, which if flawed, must be similarly mishandled in the parallel answer choice.
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Eliminating non-parallel choices
A strategy to discard answer choices that do not share the exact same flaw as the stimulus, focusing on structural matches.
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Trap of similar content
Answer choices that have similar topics but different flaws, which can mislead if you don't focus on the logical structure in parallel questions.
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Predicting the flaw first
Before looking at choices, identifying the specific error in the stimulus to guide selection in parallel flaw questions.
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Nuance: Conditional flaws
Flaws involving misused conditional statements, like affirming the consequent, which must be precisely matched in parallel scenarios.
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Nuance: Quantitative flaws
Errors in handling numbers or percentages, such as ignoring sample size, that need to be replicated exactly in parallel answers.
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Strategy: Compare structures
Systematically checking how the premises relate to the conclusion in both the stimulus and choices to ensure the flaw aligns.
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Difference from parallel reasoning
Unlike parallel reasoning questions, which seek flawless matches, parallel flaw questions require the same error in logic.
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Advanced: Layered flaws
Flaws that combine multiple errors, demanding that the parallel answer reflects the entire flawed structure accurately.
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Common flaw: Straw man
Misrepresenting an opponent's argument to make it easier to attack, a flaw that might need to be paralleled in LSAT questions.
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Common flaw: Slippery slope
Assuming a small step will lead to a chain of extreme events without evidence, potentially requiring a match in parallel flaw tasks.
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Common flaw: Equivocation
Using a word with multiple meanings in a way that shifts its sense, which could be the error to identify and parallel.
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Time management tip
In parallel flaw questions, quickly sketch the flaw before evaluating choices to avoid spending too much time on each option.
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Role of indicators in flaws
Words like 'therefore' or 'thus' that signal conclusions, helping to pinpoint where the flaw occurs for accurate paralleling.
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Avoiding content-based traps
Focusing on the logic rather than the subject matter, as choices with appealing topics might not have the correct flaw.
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Example of hasty generalization flaw
If an argument concludes all birds can fly based on observing a few, the parallel flaw would involve a similar overgeneralization from limited evidence.
Stimulus: 'Two cats I know like fish, so all cats like fish.' Parallel: 'Two students I met are smart, so all students are smart.'
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Paralleling false cause
Matching an argument that wrongly infers causation from correlation, ensuring the parallel choice does the same without justification.
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Flaw in analogy-based arguments
When an analogy is drawn without establishing relevance, the parallel flaw must replicate this unsupported comparison.
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Strategy: Use process of elimination
Narrow down choices by ruling out those that alter the flaw or introduce new errors not present in the stimulus.
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Advanced: Flaws with exceptions
Arguments that ignore exceptions to a rule, requiring the parallel answer to handle exceptions in the same faulty way.
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Common flaw: Bandwagon fallacy
Assuming something is true because many people believe it, a flaw that might need to be exactly matched in parallel questions.
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Nuance: Flaws in surveys
Errors like biased sampling in survey-based arguments, which must be paralleled precisely in the correct choice.
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Predicting answer structure
After identifying the flaw, anticipate how a parallel argument would look to spot it faster in the options.
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Trap of reversed logic
Choices that flip the flaw, such as turning a cause-effect error into an effect-cause, which doesn't qualify as parallel.
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Role of counterexamples
In flaws, counterexamples that disprove the argument are ignored, and this oversight must be mirrored in parallel answers.
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Example of false cause flaw
If an argument claims rain causes traffic because it happened after rain, the parallel would link two events sequentially without proving causation.
Stimulus: 'Sales dropped after the ad, so the ad caused the drop.' Parallel: 'Crime increased after the law, so the law caused the increase.'
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Paralleling ad hominem
Matching an argument that dismisses a claim by attacking the person, rather than the evidence, in the exact same manner.
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Strategy for abstract flaws
Translate concrete examples in the stimulus into general logical terms to find parallels that use different content but the same error.
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Common flaw: False dilemma
Presenting only two options when more exist, a flaw that parallel questions may require you to replicate structurally.
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Nuance: Flaws in definitions
Misusing or shifting definitions within an argument, which must be exactly paralleled in the correct answer choice.
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Avoiding overgeneralization in choices
Ensure the parallel flaw isn't broader or narrower than the stimulus, as only an exact match counts.
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Example of weak analogy flaw
If an argument compares apples to cars to argue about durability, the parallel would use a similarly inappropriate comparison for a conclusion.
Stimulus: 'Rockets are fast, so spaceships must be safe.' Parallel: 'Cars are quick, so trains must be reliable.'
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Paralleling circular reasoning
Finding an answer that uses its conclusion as a premise, just like the stimulus, without providing external support.
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Advanced strategy: Pattern recognition
Build familiarity with common flaw patterns through practice to quickly identify and match them in parallel questions.
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Common flaw: Composition error
Assuming that what is true of parts is true of the whole, a flaw that might need to be exactly mirrored in parallel tasks.
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Nuance: Flaws in predictions
Arguments that make unfounded future predictions based on past events, requiring the parallel to do the same.
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Trap of correct arguments
Some choices might be flawless, so always check that the selected one has the exact flaw from the stimulus.
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Role of evidence quality
In flawed arguments, poor evidence quality must be replicated in the parallel, such as anecdotal versus statistical data.
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Example of equivocation flaw
If an argument uses 'bank' to mean both riverbank and financial institution, the parallel would shift word meanings in a similar confusing way.
Stimulus: 'A bank is safe, so put your money in the bank.' Parallel: 'Light is fast, so turn on the light quickly.'
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Paralleling slippery slope
Matching an argument that assumes a series of unsubstantiated steps leading to an extreme outcome, just as in the stimulus.
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Strategy: Time the question
Allocate less time to parallel flaws by practicing to spot flaws rapidly, as they can be time-intensive.
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Common flaw: No true Scotsman
Redefining terms to exclude counterexamples, a subtle flaw that parallel questions might test for exact matching.
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Nuance: Flaws in correlations
Misinterpreting data correlations as causations, which must be paralleled without additional justification.
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Final check for parallels
After selecting an answer, verify that every element of the flaw is present to ensure it's not a partial match.