The Essay & Paragraphing
High SchoolAn essay is an argument with architecture. This chapter builds it from the ground up: the thesis that governs everything, the paragraph that carries one idea, and the cohesion that makes the whole hold together.
The anatomy of an essay
- Thesis — a single, arguable sentence stating the essay's central claim. Not a topic ("pollution") but a position ("Carbon pricing is the most effective single lever against industrial pollution"). Everything in the essay exists to support it.
- Introduction — hooks the reader, provides context, and ends on the thesis.
- Body paragraphs — each develops one supporting point.
- Conclusion — synthesises (does not merely repeat), states the significance, and closes.
The paragraph as a unit: the P.E.E.L. model
A body paragraph should carry exactly one idea, developed in a predictable shape:
- P — Point: the topic sentence stating the paragraph's claim.
- E — Evidence: a fact, quotation, statistic, or example.
- E — Explanation: analysis showing how the evidence supports the point.
- L — Link: a transition back to the thesis or forward to the next paragraph.
Cohesion and coherence
Coherence is logical flow (ideas in a sensible order); cohesion is the surface glue — transition words (however, moreover, consequently), pronoun reference, and repeated key terms — that signals the connections.
The thesis is the essay's spine: if a sentence anywhere in the essay does not ultimately serve the thesis, it is a broken rib and should be cut. This is the single test that turns a pile of true statements into an argument. Many weak essays fail not because their sentences are false but because their sentences do not add up to one claim.
The paragraph mirrors the essay in miniature: one controlling idea (the topic sentence = a mini-thesis), evidence, analysis. The most common student error is the "quote drop" — presenting evidence with no explanation, as if the fact argued for itself. It never does. The Explanation step is where the actual thinking happens; the evidence is only the raw material.
Different relationships call for different signposts. Addition: moreover, furthermore, in addition. Contrast: however, nevertheless, on the other hand. Cause: therefore, consequently, thus. Example: for instance, notably. Sequence: first, subsequently, finally. Using the wrong transition ("The data was weak; therefore we accepted it") tells the reader the opposite of what you mean.
Exercise: build a P.E.E.L. paragraph
Given the thesis "School uniforms reduce social pressure on students," here is one body paragraph built and labelled.
[Point] Uniforms lessen the visible markers of wealth that drive social comparison in schools. [Evidence] A 2019 survey of secondary schools found that in institutions with strict uniform policies, students reported 30% fewer instances of clothing-based teasing than in schools without them. [Explanation] Because a uniform standardises what every student wears, it removes the most immediate signal of family income, so the daily contest of designer labels — a contest poorer students cannot win — simply cannot take place. The pressure does not move elsewhere; it loses its most public arena. [Link] By flattening this one visible hierarchy, uniforms directly serve the broader aim of a less stratified, less anxious student body.
Why it works: the topic sentence makes a claim, not a description; the evidence is specific; the explanation supplies the causal mechanism ("because … so …") rather than leaving the statistic to speak for itself; and the link ties the point explicitly back to the thesis's word "pressure."
Now you try: write a P.E.E.L. paragraph for the thesis "Reading fiction builds empathy." Draft a point, invent a plausible piece of evidence, explain the mechanism (how inhabiting a character's mind transfers to real life), and link back to "empathy."
What makes a strong thesis statement?
AA strong thesis is arguable, specific, and singular. Arguable: a reasonable person could disagree — "The sky is blue" is not a thesis. Specific: it names the exact claim and often the reasons — "X because Y and Z" — rather than a vague topic. Singular: it advances one controlling idea, not three unrelated ones. Test your thesis by asking "could someone write an equally serious essay arguing the opposite?" If yes, you have a genuine claim; if no, you have a fact or a truism.
How long should a paragraph be?
ALong enough to develop one idea fully and no longer. There is no fixed word count, but a body paragraph that has stated a point, given evidence, explained it, and linked out is usually four to eight sentences. The real rule is unity: one idea per paragraph. When you find yourself introducing a genuinely new point, start a new paragraph. A page-long block usually hides two or three paragraphs; a one-sentence paragraph usually lacks development (though it can be used deliberately for emphasis).
How should a conclusion differ from the introduction?
AThe introduction promises; the conclusion delivers and then reaches further. A weak conclusion merely restates the thesis and lists the points again. A strong one synthesises — showing how the points combine into a case larger than any one of them — and then answers "so what?": the significance, implication, or call to action. The introduction moves from general context to the specific thesis; the conclusion reverses the motion, moving from the proven thesis back out to its wider consequences.
What is the difference between coherence and cohesion?
ACoherence is about ideas; cohesion is about words. Coherence means the points are arranged in a logical order that a reader can follow — the argument makes sense. Cohesion means the sentences are linked at the surface by transitions, consistent terminology, and pronoun reference, so the reader feels the connections. A text can be cohesive but incoherent (smoothly linked nonsense) or coherent but not cohesive (sound logic that reads as disconnected jumps). Good writing needs both: a sound structure and the signposts that reveal it.