Causal Flaws on the LSAT: Every Pattern, Every Trap

Causal reasoning is the LSAT's favorite trap. Any time an argument moves from correlation to a claim of cause, the argument is exposed to three predictable attacks — and the LSAT tests all three, sometimes on the same question.

The three attacks

Alternative cause: some other factor produced the observed effect. Reverse causation: the supposed effect is actually the cause. Coincidence: the observed correlation is chance or sampling artifact. Every credited weaken-a-causal-argument answer will fall into one of these three buckets.

How to spot a causal argument

Look for verbs like 'causes,' 'produces,' 'led to,' 'results in,' 'is responsible for.' Correlational language ('is associated with,' 'occurs alongside') combined with a causal conclusion is the giveaway that the argument has made the classic leap.

The strengthen mirror

Strengthen answers on causal arguments rule out the same three attacks — the credited answer often states that the alternative cause is absent, the timing rules out reverse causation, or a controlled comparison rules out coincidence.