How do we lay bare the structure of an argument, separating what is being claimed from the reasons offered for it?
Identify the conclusion, premises and unstated assumptions of an argument and represent its structure, distinguishing argument from non-argument
A focused answer on argument reconstruction. Finding the conclusion and premises, spotting indicator words, surfacing unstated assumptions, distinguishing arguments from explanations and assertions, and mapping argument structure.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this dot point is asking
SEAB wants you to be able to take a piece of prose and lay its reasoning bare: find the main claim being argued for, identify the reasons given, surface any assumptions left unstated, and decide whether the passage even contains an argument. This is the first and most fundamental move of the critical thinking paper. You cannot evaluate an argument until you have reconstructed it accurately, and most marks for analysis turn on getting the reconstruction right.
The answer
What an argument is
An argument is a set of statements in which one statement, the conclusion, is claimed to be supported by the others, the premises. The defining feature is the inferential link: the premises are offered as reasons for accepting the conclusion. A passage with no such link is not an argument, however many statements it contains.
Finding the conclusion first
The most reliable strategy is to find the conclusion before the premises, because the conclusion is the point of the passage and everything else is there to support it. Ask: what is this passage trying to get me to accept? Conclusion indicator words help: therefore, so, hence, thus, it follows that, which shows that. The conclusion need not come last; it can open the passage or sit in the middle.
Identifying the premises
Once the conclusion is fixed, the premises are the statements offered in its support. Premise indicators include because, since, for, given that, as shown by. Each premise is a reason that, together with the others, is meant to make the conclusion acceptable. Strip away rhetorical padding, repetition and examples that do no logical work, keeping the statements that actually do the supporting.
Unstated assumptions
Many arguments rely on a premise that is left unstated because the arguer takes it for granted. Surfacing this hidden assumption is essential, because it is often where the argument is weakest. The technique: ask what extra premise would be needed to make the conclusion follow from the stated premises. If the argument moves from "she trained hard" to "she will win," the unstated assumption is something like "training hard is sufficient for winning," which is precisely the claim worth challenging.
Argument versus explanation versus assertion
Two distinctions matter. A mere series of assertions states things without offering any as a reason for another; there is no inference, so no argument. An explanation has a similar "because" structure to an argument but a different purpose: an explanation takes its conclusion as already accepted and says why it is true, whereas an argument tries to establish a claim that is in doubt. "The match was cancelled because it rained" explains an agreed fact; "the match must have been cancelled, since the pitch was unplayable and the lights failed" argues for a claim. The test is whether the point at issue is granted or contested.
Mapping structure
Arguments can have structure beyond a single premise set. In a chain, a conclusion becomes a premise for a further conclusion. In a convergent argument, several independent premises each support the conclusion. In a linked argument, premises work only together. Representing this structure (a simple diagram or numbered standard form) clarifies which premises matter and where the argument can be attacked.
Examples in context
Example 1. An editorial with a buried conclusion. A newspaper column opens with statistics on traffic deaths, then says "clearly, the speed limit should be lowered," then adds more data. The conclusion sits in the middle, not at the end, and the surrounding statistics are premises. Reconstructing it shows that the real work is done by an unstated assumption that lower limits reduce deaths enough to justify the inconvenience, which is the contestable heart of the argument.
Example 2. Explanation mistaken for argument. A science teacher says "the ice melted because the room warmed above zero degrees." A student treats this as an argument and tries to evaluate its validity. But the ice melting is agreed; the teacher is explaining why, not arguing that it melted. Recognising it as an explanation, not an argument, prevents a misplaced evaluation and shows why the argument-versus-explanation test matters.
Try this
Q1. State the order in which you should identify the parts of an argument and why. [6 marks]
- Cue. Find the conclusion first, then the premises, then any unstated assumption, because the premises are defined as whatever supports the conclusion, so you must fix the conclusion before you can identify them.
Q2. Explain how to distinguish an argument from an explanation. [8 marks]
- Cue. Both use "because," but an explanation accounts for an already-accepted fact, while an argument supports a contested claim; the test is whether the point at issue is granted or in doubt.
Q3. For "He must be guilty, because an innocent man would not have run from the police," identify the conclusion, the stated premise and the unstated assumption. [6 marks]
- Cue. Conclusion: he is guilty. Stated premise: he ran from the police. Unstated assumption: only the guilty (never the innocent) run from the police, which is the contestable link.
Exam-style practice questions
Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Original8 marksReconstruct the following passage in standard form, identifying its conclusion, premises and any unstated assumption. 'Screen time must be harming children's sleep. After all, children who use devices late at night report feeling more tired, and tiredness is a clear sign of poor sleep.'Show worked answer →
A strong answer first finds the conclusion using the indicator "must be": the conclusion is that screen time is harming children's sleep. Then it lists the stated premises: Premise 1, children who use devices late at night report feeling more tired; Premise 2, tiredness is a clear sign of poor sleep.
Next it surfaces the unstated assumption needed to make the argument work: that the device use, rather than something else, is what causes the tiredness, and that the children studied are representative. Without this bridging assumption the conclusion does not follow, since the late-night users might be tired for other reasons (homework, anxiety) and might not represent children generally.
Present it in standard form, premises listed and conclusion below, then note the gap. Markers reward correctly locating the conclusion via the indicator word, separating it from the premises, making the hidden assumption explicit, and presenting the structure clearly. They do not require evaluating the argument here, only reconstructing it accurately.
Original12 marksExplain how to tell whether a passage contains an argument, and distinguish an argument from an explanation and from a mere series of assertions, using your own examples.Show worked answer →
The expected answer defines an argument as a set of statements in which one (the conclusion) is claimed to be supported by the others (the premises). The test is whether the passage offers reasons intended to make us accept a claim.
Distinguish a mere series of assertions: "The exam is on Monday. The hall is large. Bring a calculator." These are statements with no inferential link; nothing is offered as a reason for anything else, so there is no argument.
Distinguish an explanation from an argument: both have a "because" structure, but an explanation takes its conclusion as already accepted and tells us why it is true ("the bridge collapsed because the bolts corroded"), whereas an argument tries to establish a contested claim ("the bridge must have had corroded bolts, since it collapsed and there was no overload"). The test is whether the point at issue is in doubt and being supported, or already granted and being accounted for.
Use indicator words as clues: "therefore, so, hence" mark conclusions; "because, since, given that" mark premises (or explanations). Note that indicators are clues, not proof, and can be absent.
Judgement-style close: classify with a clear criterion. Markers reward the definition, the two contrasts with clear examples, the use and limits of indicator words, and the argument-versus-explanation test.
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