Logic / Unit 8 Logic 407 worked example, 60 to 90 seconds
A Method for Fallacy Identification
The idea
Identifying a fallacy means stating the conclusion and the support offered, asking whether that support bears on it, naming the gap, then checking whether context makes the instance legitimate.
In practice
First example. A senator's tax proposal should be rejected because the senator was twice divorced. Step one, the conclusion: reject the proposal. Step two, the support: facts about the senator's marriages. Step three: does that bear on whether the proposal is sound? No — its merits are unchanged by who advanced it. Step four, name the gap: the argument attacks the person, not the position. Step five, the near-miss check: could a person's history ever be relevant? Yes, if the question were whether to trust their unverified testimony. It is not, so the verdict stands. Second example. This medication is safe because a clinical pharmacologist reviewed the trial data and says so. Steps one and two are quick. Step three: does the support bear on the conclusion? Here it does. Step five matters most — an appeal to a genuine expert, speaking inside their field, on a question their field settles, is not a fallacy. Acquitted.
Where people slip
Step five separates analysis from fallacy-spotting as a reflex. Most fallacy names describe a move that is legitimate in some contexts, and skipping the near-miss check turns the catalogue into a way of dismissing arguments by matching their shape rather than assessing their support.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
- Nothing yet depends on this.
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