Persuasive writing is the unit most often nominated for cross-curricular work and the one most often ruined by it. A letter about recycling written in English, with no scientist involved and no reader beyond the teacher, is not a link. Curriculum for Excellence expects literacy to be everyone's responsibility, which means the other department has to be doing something real. Three links below are worth the timetabling effort, each with a joint task and a clear split of who assesses what.
The test a link has to pass
A genuine link changes both lessons. If the science teacher would have taught the same lesson anyway and simply mentioned that pupils are writing about it in English, nothing has been linked. Apply two questions before agreeing to anything. Does the other subject supply information the pupils could not get in your room? And does the writing do a job the other subject actually needs done? When both answers are yes, the persuasive writing gets an audience and a purpose, which are the two things it usually lacks.
Link one: science supplies the evidence, English supplies the argument
The joint task is a proposal to the school about heating, lighting or waste. In science, pupils measure something over a fortnight: temperature in different corridors, lights left on after four o'clock, the mass of paper in one bin. In English, they turn those numbers into a case aimed at the business manager, who agrees in advance to read three of them and reply. The split is clean. Science assesses the reliability of the measurement, English assesses whether the argument is structured, addresses the reader and handles the counterargument that the change costs money.
Pupils need the shape of the piece taught explicitly before the data arrives or they simply narrate their measurements. Grade 6 Writing Prompts – Structure, Vocabulary & Editing Tools is useful for that groundwork, because the structure and editing tools can be taught on a low-stakes topic first, so the proposal lesson is spent on the real argument rather than on paragraph shape.
Link two: social subjects supply the disagreement
Persuasion needs an opponent. Social subjects have real ones. Take a live local question your area is arguing about, a bus route, a park development, a licence decision, and give half the class each side, assigned rather than chosen. In social subjects pupils research the actual arguments and the interests behind them. In English they write a two-minute speech and deliver it, then, crucially, write a paragraph arguing the other side. That second paragraph is where the learning sits, and it is the part that a token link never gets to.
Assessment split: social subjects mark the accuracy and sourcing of the evidence, English marks rhetorical technique, tone and the concession. Both departments can bring the same pupil work to a moderation meeting, which is an unusually efficient way of talking about writing Benchmarks across a Level.
Link three: numeracy, because persuasion runs on numbers
Everyone is responsible for numeracy, and nowhere is it more concrete than here. Give pupils a small data set and ask the maths teacher to have them draw two honest graphs of it, one that makes the change look large and one that makes it look small, by choosing different axes. Back in English, pupils write a short piece using one of their graphs, then annotate what their choice did to the reader. It takes one period in each subject and it permanently changes how a class reads an advertisement.
Younger or less confident writers need more of a runway into this, and Grade 5 Writing Prompts – Structured Practice for Confident Writers gives the graded practice that lets those pupils enter the same task at a level where they can still make an argument rather than copy a frame.
Making the shared writing standards hold
The complaint from other departments is always the same: they do not want to be marking commas. They should not be. Agree three things only, and put them on a shared half-page. Sentences are demarcated. Paragraphs have one point each. Claims are supported. Everything else stays with English. That agreement is what keeps colleagues on board into a second year, and it makes the Es and Os for writing visible across the school rather than confined to one corridor.
Keep the technical accuracy work where it belongs, and give it enough time to actually change something. Grammar & Punctuation Practice – English Grades 4 to 6 covers that ground in short, markable sets, which is the version of grammar teaching that survives alongside a project. When all three links are running, the persuasive unit stops being an exercise: pupils are writing to somebody who will answer, about something that has a result.


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