One page of Rowling's planning has circulated online for years, usually with no context beyond how organized it looks. It's more useful than that reputation suggests.
Ten Columns, One Page
The grid Rowling posted to her own website years ago carries a caption that undersells what it actually shows: an entire novel's structure compressed onto a single hand-ruled sheet. Down the left side run the chapters in order. Across the top run the subplots she needed to track in parallel: the prophecy connecting Harry and Voldemort, the developing Cho and then Ginny storyline, the formation and activity of Dumbledore's Army, the workings of the Order of the Phoenix itself, the Snape and Harry tension, and the Hagrid and Grawp thread running through the back half of the book.
Where a chapter and a subplot column intersect, Rowling noted what that thread was doing during that chapter, even in chapters where it never surfaces on the page. That's the part first-time outliners tend to miss. A subplot doesn't pause just because the text isn't mentioning it. Ginny is still dealing with Cho whether or not the prose says so in chapter fourteen, and Rowling's grid made sure she always knew where every thread stood, scene by scene, instead of losing track and inventing an inconsistent detail three chapters later.
Part of the umpteenth revision of the plan of 'Order of the Phoenix'... Some of the Chapter Names changed and there are a few ideas that didn't make the final draft.
J.K. Rowling, caption to the plan on her original website
Why a Grid and Not an Outline
A conventional outline is linear. It tells you what happens in chapter one, then chapter two, then chapter three. That works fine for a book with a single storyline, but Order of the Phoenix runs six or more storylines at once, and a linear outline can't show how they interact. A grid can. Reading down one column shows an entire subplot's arc in isolation. Reading across one row shows everything happening simultaneously in a given chapter. Rowling needed both views, and only a grid gives you both at once.
That's also closer to how most experienced outliners actually use a plan: a working document that evolves along with the manuscript rather than a fixed blueprint drawn once and filed away. She called this version the umpteenth revision, which tells you the grid got redrawn as the book's shape changed, chapter titles shifted, and ideas that didn't survive got crossed out.
See the wider picture in the full J.K. Rowling writing routine.
What You Can Steal
- Track subplots on their own axis. A grid shows a storyline's full arc in one glance, which a linear outline hides.
- Account for threads even when they're offstage. A subplot doesn't freeze just because a chapter doesn't mention it.
- Let the plan change with the book. Rowling's grid went through revisions, not a single final draft.
- Build the tool that matches the problem. A single storyline might only need an outline. Six interlocking ones need something closer to a spreadsheet.