How to Write Abstracts, Introductions and Conclusions

Formulas for the three sections markers read most closely, the four-move abstract, the funnel introduction, CARS, and conclusions that add value.

Markers form their grade hypothesis in your first page and confirm it in your last. The abstract, introduction, and conclusion are therefore the highest-leverage sections per word in any assignment, and the most formula-friendly. Use the formulas.

The Abstract: Four Moves in 150–300 Words

An abstract is the whole work in miniature, not a trailer. Cover, in one to three sentences each:

Problem/purpose: what question the work addresses and why it matters.
Method: how it was investigated (design, sample, analysis).
Findings: the actual results, with key numbers for quantitative work. The classic error is coyness: "findings are discussed" tells the reader nothing.
Implication: what the findings mean for theory or practice.

No citations, no abbreviations needing definition, no material absent from the main text. Written last, always.

The Introduction: Funnel Then Map

Move from broad to narrow, then promise the route:

Context: establish the territory and why it matters, one or two sentences of genuine stakes, not throat-clearing ("Since the dawn of time…" is banned).
Problem/gap: the tension, debate, or unknown your work addresses.
Thesis / aim: your position (essay) or research aim and questions (dissertation), one clear sentence.
Roadmap: "This essay first…, then…, before concluding that…".

For research writing, Swales' CARS model formalises this as three moves: establishing the territory (what is known), establishing the niche (what is missing or contested), and occupying the niche (what this study does). Literature-review introductions and journal articles are graded against exactly this pattern, whether the marker names it or not.

The Conclusion: Answer, Synthesise, Extend

A conclusion that merely repeats the introduction wastes its structural position. Three jobs:

Answer: state your response to the question/thesis directly, the reader should be able to quote your answer from this paragraph.
Synthesise: show how the strands of argument combine to support that answer. This is compression with judgment, not a list of "firstly I discussed…".
Extend: implications, limitations, and what follows, for practice, for policy, or for future research. This is where a 2:1 becomes a first: the conclusion demonstrates you can see beyond the assignment.

Hard rules: no new evidence, no new citations (limitations excepted by some conventions), no sudden humility ("this essay has only scratched the surface") and no sudden grandiosity ("this changes everything").

Symmetry Check

Read your introduction and conclusion back to back, skipping the middle. They should feel like a question and its answer, same key terms, same scope, resolved tension. If the conclusion answers a slightly different question than the introduction posed, the drift happened somewhere in the body: fix whichever end no longer represents the argument you actually made.

Timing Strategy

Draft the introduction early to direct your writing, but rewrite it last to match what you actually argued. Write the conclusion when the body is stable. Write the abstract after everything, it summarises reality, not intention.

Three Jobs, Clearly Separated

	Abstract	Introduction	Conclusion
Reader	Someone deciding whether to read	Someone who has decided to	Someone who has finished
Job	Replace the piece in miniature	Set up the argument	Land what the argument showed
Contains findings?	Yes, specifically	Usually signposted, not detailed	Yes, synthesised
New material?	No	No	No
Stands alone?	Yes	No	No
Written	Last	Early, rewritten last	After the body is stable

The Introduction Funnel

A reliable introduction narrows steadily from context to your specific claim. Five moves cover it.

Context, one or two sentences establishing the territory. Not the dawn of time.
Narrowing, to the specific problem or debate.
The gap or the tension, what is unresolved, contested or overlooked.
Your thesis, the position the essay will defend, stated plainly.
The route, a brief signpost of how the argument proceeds.

The thesis is the load-bearing sentence and the one most often missing. It must be contestable. "This essay examines the causes of the 2008 crisis" announces a topic. "This essay argues that regulatory capture was a more significant cause than mispriced risk" states a position someone could dispute, which is what makes it a thesis.

Conclusions That Do Something

The weakest conclusion restates the introduction in different words. A conclusion should sound like it was written by someone who has just been through the argument, because it was.

Restating. In conclusion, this essay has examined the causes of the 2008 financial crisis. It looked at regulatory capture and mispriced risk. Both were important factors in the crisis.

Concluding. Regulatory capture better explains the crisis than mispriced risk, because mispricing was itself downstream of supervisory failure rather than independent of it. The implication is uncomfortable for reform proposals that focus on capital requirements alone, since these leave the supervisory relationship untouched. Whether the post-2010 architecture has changed that relationship, rather than merely the rules it enforces, remains open.

The second version answers the question, states a consequence, and leaves a genuine open problem. It also does not begin with "in conclusion", which the reader can see for themselves.

Openings That Waste the First Sentence

The opening sentence is the most valuable position in the essay and the most commonly squandered. Four habits account for nearly all of it.

The universal claim. "Throughout history, humans have communicated." True, unfalsifiable, and it tells the reader nothing about your essay.
The dictionary definition. "The Oxford English Dictionary defines justice as..." Define contested terms in your own words, with a scholarly source, at the point where the definition does work.
The topic announcement. "This essay will discuss climate policy." A label, not a claim.
The rhetorical question. "But what is really meant by fairness?" Answer it instead.

What works is starting at the specific tension the essay resolves. "Two decades of minimum wage research has failed to settle a question that should be empirically simple" is an opening that has already told the reader what kind of essay follows and why they should care.

The Full-Circle Test

Read your introduction and your conclusion together, ignoring everything between. They should be answering the same question, and the conclusion should say something the introduction only promised.

Two failures show up immediately. If they say the same thing, the essay has not developed an argument, it has restated one. If they answer different questions, the argument drifted somewhere in the body, and the fix is to decide which one the essay actually delivers and rewrite the other end to match.

Common Mistakes and Fixes

Mistake	Fix
"Since the dawn of time" openings	Start at the specific problem
No thesis in the introduction	State a contestable position in one sentence
Conclusion introducing new evidence	Move it into the body where it can be developed
Abstract that promises rather than reports	Put the actual findings in it
Introduction written first and never revised	Rewrite it against the finished argument
Dictionary definitions as an opener	Define only contested terms, and cite properly
Conclusion apologising for limitations	State limitations with their consequence, not as regret

Where Ethical Support Fits

Asking a tutor whether your thesis statement is clear is among the most efficient uses of a tutorial, because an unclear thesis weakens every paragraph downstream. Writing centres work on introductions and conclusions constantly, since they are the most teachable parts of an essay.

What stays yours is the position. The thesis is your claim about the question, and the conclusion is your judgement about what the evidence showed.

Frequently Asked Questions

How long should the introduction be?

Roughly 10 per cent of the piece. In a 2,000-word essay that is around 200 words, which is enough for the five moves and nothing else.

Can I use "I" in the introduction?

Depends on discipline. "This essay argues" is universally safe. Some fields accept "I argue" readily, and others do not.

Should the conclusion have citations?

Usually few or none, since it synthesises what you have already evidenced. A citation appearing only in the conclusion suggests material that should have been in the body.

Does every essay need an abstract?

No. Abstracts belong to dissertations, reports, articles and conference submissions. Most undergraduate essays do not have one.

How do I write a conclusion when I have run out of words?

Cut from the body rather than dropping the conclusion. An essay that stops mid-argument reads as unfinished, which costs more than a slightly thinner body section.

Can the conclusion recommend future research?

Yes, briefly, provided each suggestion follows from a specific limitation rather than being generic. "Further research is needed" on its own adds nothing.

Your Next Step Today

Copy your introduction and conclusion into a blank document and read them back to back. Whatever you notice in that thirty seconds is the most valuable structural feedback available to you, and it costs nothing.

Trusted Sources

University of Southern California, The Introduction. Accessed 11 August 2026.
University of Southern California, The Conclusion. Accessed 11 August 2026.
University of Southern California, The Abstract. Accessed 11 August 2026.
University of North Carolina Writing Center, Thesis Statements. Accessed 11 August 2026.
University of North Carolina Writing Center, Conclusions. Accessed 11 August 2026.

Conventions differ by discipline and brief. Where this guide and your assignment brief differ, follow the brief.