Rowling's Plot Spreadsheet This one is from Order of the Phoenix. A spreadsheet plot written out by J. Her approach to spreadsheet plotting is to divide the columns by chapter number, story timeline, chapter title, main plots and subplots.
And because their sneaky achievements deserve to be memorialized forever (duh), Pottermore created an awesome infographic of a history of their mischief. | This Illustrated Timeline Of Fred And George's Pranks Is So Amazing