Trey wrote:I want to put this Dorkman and the Dorkman from the religion thread in a pit and make them fight.
I think you'll find he's declared himself impressed by HP as well. 
What I'd love is if we someday got a book or set of books collating the early drafts and development notes, a la History of Lord of the Rings. (Naturally it would be called Hogwarts, a History.) But seeing as how she was super poor at the time and didn't know if it would go anywhere, she probably tossed a lot of that as she went or burned it for warmth or something. 
I'm sure she had a series bible of her own, but I agree that a lot of details certainly got filled in as she went. What she knew when is a question only she can answer, but it's fun to guess.
EDIT: For example, I would bet that she had sorted out the broad strokes of horcruxes before she began writing the first book, though whether or not she'd given them that name isn't possible to know nor really relevant. An author as fixated on motivation, as Zarban pointed out, would have to know for her own peace of mind how Voldemort survived the rebounding curse.
SPOILER
ShowSo much is made of the connection between them and Harry's scar that if she had sorted out horcruxes she had certainly already decided Harry was one of them.
She probably had not yet decided as of the first book what any of the others would be, though I would say she wrote
Chamber knowing the nature of the diary. By the same token, I would bet she had not decided on the difficulty level of destroying horcruxes nor that basilisk venom was one of the only ways to do it -- at the time stabbing the diary just in general was probably enough -- and so that bit and the whole "goblin steel takes in that which makes it stronger" chicanery is pure retcon to create more of a challenge for the trio in the final volume.
But of course this could all be nonsense. Only Jo Rowling knows for sure. 
Last edited by Dorkman (2013-11-23 02:25:24)