9.1 Anatomy of an Argument: Claim, Evidence, Warrant
Philosopher Stephen Toulmin's model breaks every real-world argument into parts. The three core parts:
| Part | Definition | Example |
|---|---|---|
| Claim | The conclusion you want accepted | "Our college should adopt open-book examinations." |
| Evidence (Grounds) | Facts, data, examples supporting the claim | "In pilot courses, open-book papers reduced rote copying and produced better application-level answers." |
| Warrant | The (often unstated) principle connecting evidence to claim | "Examinations should test application, not memory." |
Three optional reinforcements: backing (support for the warrant itself — employers value application skills), qualifier (words that limit the claim — "in theory-heavy courses," "generally"), and rebuttal (acknowledged exceptions — "except in foundational courses where recall is the skill").
Why the warrant matters: most disagreements are warrant-level. Your opponent may accept your data yet reject your principle. Argue the warrant explicitly when your audience is hostile.
9.2 A Catalogue of Logical Fallacies
A fallacy is a reasoning error that makes an argument invalid or dishonest, however persuasive it sounds.
| Fallacy | Definition | Example |
|---|---|---|
| Ad hominem | Attacking the person, not the argument | "Why listen to her plan? She failed two subjects." |
| Straw man | Distorting a position to defeat the distortion | "He wants flexible attendance, i.e., he wants empty classrooms." |
| False dilemma | Pretending only two options exist | "Either ban phones on campus or accept failing grades." |
| Slippery slope | Claiming one step inevitably leads to disaster | "Allow one late submission and soon no one will meet any deadline." |
| Hasty generalization | Concluding from a tiny sample | "Two seniors got jobs without internships; internships are useless." |
| Appeal to (false) authority | Citing an authority outside their expertise | "A famous actor says this diet cures illness." |
| Bandwagon (ad populum) | Popularity as proof | "Everyone uses this app, so it must be safe." |
| Red herring | Diverting to an irrelevant issue | "Why discuss lab fees when the nation faces bigger problems?" |
| Circular reasoning | The conclusion restated as its own premise | "He is trustworthy because he never lies." |
| Post hoc | After it, therefore because of it | "I wore this shirt and we won; the shirt won it." |
| Tu quoque | Deflecting by charging hypocrisy | "You criticise my late report? You were late in March!" |
| Appeal to emotion | Substituting feeling for reason | "Think of the founders' tears if we change the logo." |
Exam technique: to name a fallacy, (1) identify the claim, (2) identify what is offered as support, (3) state precisely why the support does not connect — then supply the label.
9.3 Handling Counter-Arguments: Concede and Refute
Ignoring opposition weakens ethos; a fair concession strengthens it. The concede–refute move:
- State the opposing view accurately (steel man, not straw man): "Critics argue that open-book exams reward search skills over understanding."
- Concede what is true: "Badly designed open-book papers do exactly that."
- Refute with a pivot: "But the flaw lies in question design, not the format: application-based questions cannot be answered by searching."
Useful frames: "Admittedly, ..."; "It is true that ..., however ..."; "This objection holds only if ...".
9.4 Classical vs Rogerian Argument
| Aspect | Classical (Aristotelian) | Rogerian |
|---|---|---|
| Goal | Win: prove your position correct | Reduce conflict: find shared ground |
| Structure | Thesis → proofs → refutation → conclusion | Fair statement of their view → contexts where it is valid → your view → compromise |
| Tone | Assertive, confident | Empathetic, non-threatening |
| Best for | Neutral or friendly audiences; debates; editorials | Hostile or emotionally invested audiences; negotiations |
Rogerian in practice: writing to a management that rejected fee-waiver requests, you would first summarise their budget constraints so accurately they would sign your summary — only then propose a phased waiver funded by alumni. The audience decides the architecture.
9.5 The Persuasive Case: A Checklist
- Claim precise and qualified? 2. Evidence recent, relevant, sufficient? 3. Warrant stated where the audience may reject it? 4. Strongest counter-argument conceded and refuted? 5. Fallacies swept out? 6. Structure matched to audience temperature (classical vs Rogerian)?
🎯 Exam Focus
- Explain claim, evidence, and warrant with an original example. Why is the warrant usually invisible?
- Name and define any six logical fallacies with one example each.
- Identify the fallacy: (a) "Ban video games or watch grades collapse." (b) "My opponent, who dresses shabbily, cannot manage a budget."
- Write a concede–refute paragraph responding to: "Group projects are unfair because one student does all the work."
- Differentiate classical and Rogerian argument. When is Rogerian strategy superior?
- "A fair concession strengthens ethos." Explain with reference to counter-argument handling.