How to outline a book
Outline at the level of *what changes*, not *what happens*. A list of events is not a structure; a sequence of changes is. Whichever method you use, the test is the same: can you say what each chapter is for in one sentence, and does removing any chapter break the ones after it?
Four methods, and who each suits
There is no correct method. There is a method that suits how your mind works, and using the wrong one is why many people believe they cannot outline.
| Method | How it works | Suits | Fails when |
|---|---|---|---|
| Index cards | One card per scene or chapter. Physically rearrange until the order is right. | Anyone who thinks spatially. Excellent for memoir, where chronology is the trap. | You have 200 cards and no sense of shape. |
| Reverse outline | Write first, then outline what you actually wrote, chapter by chapter, in one line each. | Writers who cannot plan in advance and stall when made to. | Used too late, after 100,000 words with no through-line. |
| Three-act / four-part | Fixed structural beats: setup, complication, crisis, resolution. | Commercial fiction, thrillers, anything genre-shaped. | Applied to memoir or literary fiction, where it flattens the material. |
| Argument tree | One claim at the top, supporting claims beneath, evidence beneath those. | All non-fiction. Business books especially. | The book is actually a story, and the tree strips the life out of it. |
Your free private Book Coach
A short private conversation, one question at a time. By the end you should have a clearer sense of what your book is actually about, who it is for, the shape it wants to take, and the one next thing to do. It never writes a word for you.
It asks questions and gives you your own answers back. It does not write the book. You can copy or download the finished plan straight from the page, free and with no email needed.
Outline what changes, not what happens
The most common failed outline is a list of events. Chapter one: she arrives. Chapter two: she meets the neighbour. Chapter three: they go to the coast.
Nothing in that tells you whether the book works, because it does not say what is different at the end of each chapter. Rewrite each line as a change: she arrives believing she will sell the house → she leaves chapter three unable to say why she has not put it on the market.
An outline built of changes tells you instantly where the book stalls — you will see three chapters in a row where nothing moves, and that is the sag every reader would have felt on page 140.
The two tests that matter
The one-sentence test. Can you say what each chapter is for in one sentence, without using 'and'? A chapter needing two sentences is usually two chapters, or one chapter with a passenger.
The removal test. Take any chapter out. Do the chapters after it still make sense? If yes, that chapter is not load-bearing — it may be lovely, and it is costing the reader momentum.
These two questions, applied honestly to an outline, catch most of what a £400 assessment would find on the finished draft.
Outlining memoir, which is the hardest case
Memoir resists outlining because the events already exist in a fixed order and that order feels like the structure. It almost never is.
The method that works: write each scene you can actually see — not each thing that happened, each scene you can see — on a card. Then find the question the book is asking. Then order the cards by what best answers that question, ignoring chronology entirely.
You will find you have twelve strong cards and forty weak ones, and that the strong ones cluster around two years of your life. That is your book, and it is usually not the one you set out to write.
Non-fiction: the argument is the structure
For business books, self-help and expertise-led non-fiction, the outline is an argument, not a sequence.
Write the central claim in one sentence. Then the three to five claims that must be true for it to hold. Each of those is a part or a chapter. Beneath each, the evidence: the story, the data, the case, the practical step.
When this is done properly, two things happen. Chapters that were in the book because you know a lot about them fall out, because they support nothing. And the order stops being negotiable — you cannot argue claim three before claim two.
This is why business books benefit most from outlining and receive it least.
About Your Book Pro
Your Book Pro is a book-writing platform built in Britain. Start with an idea, notes, half a draft, a podcast, or a finished manuscript, and use our purpose-built AI tools for planning, feedback, editing, proofreading, cover designs, and to create print-ready files. Writing is totally free: you can type, upload or speak your book as much as you like, and use only the editing tools you need with Plus, or go unlimited with Pro.
Produce world-class drafts at the fraction of the cost of hiring a human editorial team.
Every account starts with 1,000 welcome credits, and a plain export of your own words is free.
Each guide says plainly when a person does the job better than AI. Guides on legal topics are general information, not legal advice.
If you do not yet know what the book is, start with the Book Coach — free at yourbook.pro/book-coach, no account needed. Ten minutes of structured questions gets most people to a premise they can say aloud, which is the precondition for any outline being worth building.
Then Plan Feedback tests the structure you arrive at. It reads your outline against your genre's real requirements and reports where the shape will cause trouble — the chapter doing two jobs, the three chapters where nothing changes, the promise made in chapter one and never kept. Running it before you write is the cheapest structural intervention available, and you can run it again every time the plan moves.
If you have already written a great deal without a plan, that is fine and common: upload it and run Detailed Editorial Feedback instead, which reverse-outlines what you actually have.
Test your plan
Try the Book Coach — free, no account
Email me my free Book Coach linkQuestions people ask
- Do I have to outline?
- No. Plenty of good books are written without one. But writers who don't outline in advance nearly always outline in revision — the reverse outline — and doing it at some point is not optional if you want the structure to hold.
- How detailed should an outline be?
- Detailed enough that each chapter has a stated purpose; loose enough that you can still discover things. One paragraph per chapter suits most people; some need a page, some need a line.
- What if the book stops following the outline?
- That is usually the book being right and the outline being provisional. Stop, re-outline from where you are, and check the removal test again. An outline is a tool, not a contract.
- How many chapters should a book have?
- For a 70–90,000 word book, typically 20–40 chapters of 2,000–4,000 words. Shorter chapters suit thrillers and business books; longer suit literary fiction. There is no rule, only reader expectation by genre.
- Should I outline a memoir chronologically?
- Start by ignoring chronology entirely. Order by what answers the book's question, then check whether the reader can follow it. Chronology is the fallback, not the default.