Argument structure
An argument structure essay is a piece of writing built around one contestable claim, supported by an ordered set of premises, with the strongest objection answered inside the essay rather than left outside it. The structure is not decoration. It is what lets a reader see which sentence is the conclusion, which sentences are carrying it, and which link would have to break for the whole thing to fall over.
Argument structure applies to any argument, spoken or written, and it always resolves into the same small anatomy. Learning to see that anatomy is what makes an essay writable, and it is also what makes somebody else's essay checkable.
The basic structure of an argument: claim, grounds, warrant
The basic structure of an argument has 3 obligatory parts and 3 optional ones. Stephen Toulmin set them out in The Uses of Argument, published in 1958, and the vocabulary has stuck because it names things ordinary logic notation leaves silent.
- Claim. The conclusion you want granted. The bakery should switch its flour delivery to the early slot.
- Grounds. The evidence offered. The late slot arrived after the ovens were loaded on 11 of the last 14 weekdays.
- Warrant. The principle connecting grounds to claim, usually unstated. A delivery that arrives after the ovens are loaded costs a production run.
- Backing. Support for the warrant itself, needed when a reader will not simply grant it.
- Qualifier. The strength claimed: usually, in most weeks, always. A qualifier is a promise, and an unqualified claim promises the most.
- Rebuttal. The stated conditions under which the claim would not hold.
The warrant is the part that decides most disputes, because it is the part nobody writes down. Two people who agree on every ground and still disagree are disagreeing about a warrant. That is why the first move in argument analysis is to write the warrant out as a full sentence and see whether it survives being said aloud.
Classical argument structure and what each part is for
Classical argument structure is the 6 part arrangement taught in Roman rhetorical handbooks, including Cicero's De Inventione, and it is still the most reliable outline for an argumentative essay. Its virtue is that it forces the objection into the body of the essay instead of leaving it to an unimpressed reader.
| Classical part | What it does | In a modern essay |
|---|---|---|
| Exordium | Establishes why the question is live | Opening paragraph, one sentence of context |
| Narratio | Lays out the agreed facts | Background the reader and writer both accept |
| Partitio | States the claim and previews the support | Thesis plus a one line map |
| Confirmatio | Gives the reasons, strongest first or last | Body paragraphs, one premise each |
| Refutatio | States and answers the counter argument | The concession and reply section |
| Peroratio | Closes on what follows if the claim holds | Consequence, not a summary |
Notice what the classical template does not contain: a paragraph restating the thesis in different words. The peroratio was for consequences, not for repetition, and an essay that ends by summarizing itself has spent its last paragraph telling the reader something already known.
How to structure an argument essay
To structure an argument essay, write the claim first and the introduction last. The order in which an essay is read is not the order in which it can sensibly be built, and beginning with an opening paragraph commits you to a thesis you have not yet tested. 6 steps:
- Write the claim as a single declarative sentence that a reasonable person could deny. If nobody could deny it, it is a fact and needs no essay.
- List every reason you have for the claim, one line each, without arranging them.
- Write the warrant under each reason: the principle that turns that reason into support.
- Cut any reason whose warrant you cannot defend, however much you like the sentence.
- Order the survivors so each paragraph makes the next one possible, which is usually weakest to strongest.
- Draft the refutation before the introduction, because the objection often changes the qualifier on your claim.
Each body paragraph carries exactly one premise. When a paragraph has two, the reader cannot tell which one the evidence in it was supporting, and neither, usually, can the writer.
Counter argument structure: concede, then separate
A counter argument has the same structure as the argument it opposes, which is what makes it answerable. The reply that works has two moves in a fixed order: concede the part that is true, then show that the conceded part does not reach the opponent's conclusion.
Return to the bakery. The objection: the early slot costs more per delivery, so switching raises costs. A weak reply denies the price difference, which is checkable and probably correct. A strong reply concedes it and separates the claims: the higher price is real, and a lost production run costs more than the price gap, so the objection identifies a cost without weighing it against the cost it prevents.
Two things a counter argument section must never do. It must never answer a claim the opponent did not make, which is why the objection should be stated in the form its holder would recognize. And it must never shift to the person holding it, the move named ad hominem, which changes the subject from the delivery schedule to the character of whoever raised it and settles nothing.
How to structure an argument analysis
To structure an argument analysis, describe the argument before you judge it. An analysis that opens with a verdict has told the reader nothing they can check. Work in three passes:
- Map the parts. Number every claim in the source, mark the conclusion, and mark which numbers feed it.
- Recover the warrants. Write out the unstated principles the map requires, in full sentences.
- Judge one link at a time. For each link say whether the support is deductive, meaning the conclusion cannot fail if the premises hold, or inductive, meaning it is only probable. Deductive vs inductive reasoning sets out the difference in detail, and Logical reasoning covers the three conditions any link has to meet.
Drawing the argument structure diagram
An argument structure diagram is a box and arrow picture: one box per claim, an arrow from each supporting claim to the claim it supports, and the conclusion at the bottom with no arrow leaving it. Two arrangements matter. Convergent support means each premise reaches the conclusion independently, so removing one leaves the rest standing. Linked support means the premises only work together, so removing one destroys all of them. Drawing the two differently, separate arrows for convergent and a joined arrow for linked, tells you immediately how fragile an argument is.
Then run the test that finishes any analysis:
Which single box, if it were false, would leave the conclusion unsupported?
That box is where the argument is load bearing, and it is where an honest critic and an honest author should both be spending their time. Critical thinking exercises works this drill on prepared passages with the maps supplied.