Good sentences can still add up to a confusing document if they come in the wrong order or wander from point to point. This level moves from the sentence to the larger shapes of writing: the paragraph, the section and the whole document. The goal at every scale is the same. The reader should always know where they are, how the current part connects to the last one and where things are headed.

The paragraph as a unit of thought

A paragraph is not just a block of text broken off when it looks long enough. In most nonfiction it develops one main idea. The topic sentence states the main idea of its paragraph, and in explanatory and persuasive writing it usually comes first, so that a reader skimming the opening lines of each paragraph can follow the whole argument. The sentences that follow support, explain or illustrate that idea. A sentence that serves a different idea belongs in a different paragraph, or nowhere.

Length should follow content. A paragraph that runs most of a page usually holds more than one idea and can be split. A string of one-sentence paragraphs, common online, can make an argument feel like a list of slogans. There is no fixed rule, but three to seven sentences is a common shape for paragraphs in essays and reports.

Coherence and transitions

A paragraph is coherent when each sentence connects clearly to the next. Several tools create those connections. Repeating a key term, rather than swapping in synonyms for variety, tells the reader you are still talking about the same thing. The old-to-new principle from the last level links each sentence's end to the next one's start. And transition words name the relationship between ideas outright.

Each transition makes a promise. "For example" promises an illustration of the point just made. "However" and "but" promise a contrast. "Therefore" and "as a result" signal that a result follows from what came before. "Similarly" promises a parallel case. Used accurately, transitions are signposts. Used carelessly, they mislead: a "therefore" in front of a sentence that does not follow from the last one is a small false claim.

Choosing a structure

Whole documents have shapes too, and choosing one before drafting saves a great deal of rewriting. Some common patterns: chronological order, for histories, instructions and incident reports; problem and solution, for proposals that describe what is wrong and then what should be done; compare and contrast, for weighing options; and general to specific, for explanations that start with a principle and move to examples. A proposal to fix a local problem fits naturally into a problem and solution structure.

News writing has its own famous pattern. The inverted pyramid puts the most important facts first, then details in decreasing order of importance, so that a reader who stops after one paragraph still has the essentials and an editor can trim from the bottom. Its origins are often linked to nineteenth century telegraph reporting, though historians debate how and when it became standard.

Outlines, reverse outlines and headings

Many writers sketch a rough outline before drafting: a list of the main points in order. Plans change as you write, and that is fine. After drafting, a second tool often helps more. A reverse outline is a list of each paragraph's main point, made after the draft is written. If you cannot state a paragraph's point in a line, the paragraph probably lacks one. If two paragraphs make the same point, merge them. If the list of points does not form a sensible sequence, reorder them.

Longer documents benefit from headings, which let readers scan and jump to what they need, and from a short forecast near the start, such as "This memo explains the problem, compares three options and recommends one." Endings matter as well. A strong conclusion shows why the point matters instead of only repeating it: what follows from it, what should happen next or what larger question it opens.

Worked example: a proposal for a crosswalk

A neighborhood group drafts a letter asking the city for a crosswalk near an elementary school. The first draft opens with the history of the neighborhood, describes a near miss in paragraph four, mentions the actual request in paragraph six and ends by repeating the history.

A reverse outline exposes the trouble. Listing each paragraph's point shows that the request appears late, that two paragraphs both describe traffic, and that the ending adds nothing. The group switches to a problem and solution structure. Paragraph one states the request and the exact location. Paragraph two describes the problem: how many children cross there each morning and the near misses parents have recorded. Paragraph three proposes the solution and its rough cost, which the group found in the city's own budget for similar projects. Paragraph four explains what the city gains, fewer injuries and safer routes to school, and asks for a reply by a specific date.

Each paragraph now opens with a topic sentence, and transitions such as "as a result" and "for example" are used only where they are true. A council member who reads only the first line of each paragraph would still get the whole case, which is exactly the test a busy reader will apply.