Reading guide
Argument Reconstruction: From a Paragraph to Premises, Objections and Replies
Reconstruct one complete argument without inventing the author’s premises. Compare three candidate bridges and distinguish a premise objection from a counterexample.
Updated
Keep the text and your reconstruction separate
Write the conclusion, copy the stated supporting claims, and mark every added bridge as a proposed reconstruction. An unstated premise is not simply an extra sentence that would make your preferred argument succeed. It must be a plausible interpretation of the support the passage offers.
First ask whether the passage is arguing for a claim or explaining an accepted event. Then preserve qualifications such as “some,” “normally” and “under these conditions.” Removing them changes the argument before you have assessed it.
A complete worked paragraph
Invented seminar text: This report is evidence for our proposal, so it should be available for every student in the seminar to inspect.
- Stated premise: this report is evidence for the proposal.
- Proposed bridge: material used as evidence for this seminar's proposal should be available for every student in the seminar to inspect.
- Conclusion: this report should be available for every student in the seminar to inspect.
The conclusion follows if both premises are accepted under this interpretation. That formal result does not establish the bridge's truth or prove that these are the author's exact unstated words. A reader should check the surrounding discussion or ask the author.
“Available to inspect” also needs a consistent meaning. Secure class access and unrestricted public distribution are different claims. Copyright, privacy or access constraints could matter in a real case; the invented paragraph does not settle them.
Compare three possible additions
| Candidate | Problem or merit |
|---|---|
| Every document anywhere should be public. | It is much broader than the seminar claim and needlessly commits the author to unrelated cases. |
| This report should be available to every student. | It simply repeats the conclusion instead of exposing a connecting principle. |
| Evidence for this seminar's proposal should be inspectable by every seminar student. | It supplies a relevant general bridge with the same scope; its interpretation and defensibility still need checking. |
Charity is not unlimited improvement. If the original text supports only a weaker or different premise, report that. Making the author say whatever would win your argument defeats the purpose of reconstruction.
Distinguish three targets for criticism
- Premise objection: dispute that the report really is evidence for the proposal, or dispute the proposed access principle.
- Inference counterexample: show a case in which all of the reconstruction's premises are true but its exact conclusion is false. A case that falsifies a premise does not refute deductive validity.
- Interpretation objection: argue that the bridge or meaning supplied by the reconstruction does not fit the original text.
A counterexample is a particular way to support an objection, not a synonym for every criticism. In a definition test, the target is different again: an item accepted by the proposed definition but outside the intended category, or an intended member excluded by it. Keep the target explicit.
Save a reconstruction someone else can audit
Use these fields: original passage and location; exact conclusion; stated premises; proposed additions; interpretation of key terms; support for each premise; inference test; strongest objection; possible reply; unresolved question.
Does an invalid argument show that its conclusion is false?
No. It shows that this inference does not guarantee the conclusion from these premises. The conclusion could be true for other reasons.
Does adding a premise to make an argument valid prove the author accepted it?
No. Validity and interpretive evidence are separate checks.
Practise the inference test with ten worked valid/sound examples. Use the necessary and sufficient conditions worksheet when the disputed claim is a conditional or definition.
Sources and further reading
- Internet Encyclopedia of Philosophy — Argument
Introduction and structural approach: propositions offered as support, reasoner intent and premise/conclusion indicators.
- Stanford Encyclopedia of Philosophy — Definitions
§1.4 descriptive adequacy and actual/possible counterexamples; definition tests are distinguished from arbitrary stipulation.