What it is. The three-part structure is the default shape, departed from only on purpose.
Why our test works. Grade 6 taught structure; Grade 8 has to make it automatic and then make it OPTIONAL — a writer who cannot depart from the three-part shape has not mastered it either. Testing for a unique job is what exposes the commonest structural failure at this age, an introduction and a conclusion saying the same thing in different words, with a middle that could be reordered at random.
Leans on. Grade 6's Structure chapter. Grade 8 makes it automatic.
Watch for. If the introduction and conclusion could be swapped, neither is doing its job. That check takes ten seconds and finds most of them.
Read and use Three-Part Essay Structure from Advanced Academic Writing, pp.6–6. The worked example is the one you build on the board: Teacher reads the key passage of Three-Part Essay Structure aloud with the book open and m The class reads Writing Book 8, p.58 — our own page, so a child who was absent can still get the lesson.
You open by saying where this sits — what it follows and what it is part of — in one sentence, and then you give them the reason it matters, in your own words, for about ten seconds. Before anything new, sixty seconds of retrieval on U1 set 1, U8 set 1: ask, take the answers from boards rather than hands so you see all thirty, and do not re-teach — note who has lost it and carry on.
Then you do one yourself, building it on the board and leaving it up: Teacher reads the key passage of Three-Part Essay Structure aloud with the book open and models the move it teaches on one sentence. The board copy is what they look back at when they stall, so it stays there for the whole lesson.
The We-do is the main whiteboard moment of the lesson — short answers, boards up on your signal, every child visible at once. Class applies the move from Three-Part Essay Structure to two sentences together, checking against the book's own example. If the answer is a whole sentence rather than a word, take it on their notebooks instead, because a sentence written on a whiteboard is written once and destroyed.
They open Writing Book 8 to page 58 and read it with you. Stop at the worked example and let them look at it.
Exit directions in full, standing still, before anyone moves. Then they work alone: In your notebook: apply Three-Part Essay Structure to three sentences of your own, double-spaced.
You close on the exit direction — Read out one sentence that uses Three-Part Essay Structure. — taken from every child before anyone stands, and then the line you want them to still have tomorrow: Beginning, middle, end — and each part has a job it alone does.
If the introduction and conclusion could be swapped, neither is doing its job. That check takes ten seconds and finds most of them.