Where to Divide a Paragraph to Meet a Rhetorical Goal (ORG 504)

A paragraph holds together because every sentence serves one job. Maybe the job is describing something, maybe it's arguing a case, maybe it's narrating events in order. The moment a sentence starts a different job, a seam has opened, and that seam is where a new paragraph belongs. This is true whether the paragraph is four sentences or forty. A reader groups sentences by what they're doing, not by how many there are, so a one-paragraph description that does only one job all the way through stays one paragraph no matter its length.

Finding the seam means asking what each sentence is doing, sentence by sentence, until the job changes. A paragraph might report facts about a flood for two sentences, then pivot to arguing for levees on the third. That pivot, not any word count, marks where the new paragraph starts. The sentence that starts the new job becomes the opening line of the new paragraph, and everything before it stays with the old job.

This matters more once emphasis enters the picture. If a writer wants a later idea to land hard, giving it a paragraph of its own does real work: paragraph breaks act like a drumroll, signaling 'pay attention, something new and important starts here.' So when a question asks where to split for emphasis, the answer is still the seam where the subject changes, but now the reason to care about that seam is sharper. This connects directly to how paragraphs open and close elsewhere: a strong opening sentence announces a paragraph's job, and a strong closing sentence finishes it, which is exactly why the sentence arguing for the new idea should close its own paragraph rather than trail off the old one.