Logic and fallacies
KS5 · 40 minutes · Test an argument for validity and soundness.
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Our learning goal
Test an argument for validity and soundness.
Your turn: Choose one thing you would like to understand by the end.
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My lesson notes & project
Full teaching script
- Today: Logic and fallacies. Our goal: Test an argument for validity and soundness.
- Take one idea at a time. Pause after each sentence; ask for repetition whenever you need it.
- An argument is valid when the conclusion must follow from the premises, and sound when it is valid and the premises are true. Common failures: ad hominem (attacking the person), straw man (attacking a distorted version), false dilemma (only two options offered), and affirming the consequent. Spotting the shape of an argument is more useful than agreeing with its conclusion.
- Together: choose one example from the explanation and show how it works. What do you notice?
- Your turn: Find three adverts and name the fallacy each relies on.
- Reflect: what made sense, and what would you like explained differently?
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