É exatamente como Rowling sempre planejou (pelo menos para a série principal)
Richard: I was dodging around the death bit, because I know you can't answer that question, But you know how Conan-Doyle got sick up to there of Sherlock Holmes ...
Jo: Yeah.
Richard: ... so pushed him off the cliff at the Reichenbech falls, I'm not asking if you have done that obviously, but have you ever been tempted to bump him off because it is such a huge thing in your life.
Jo: I've never been tempted to kill him off before the end of book 7. I have always planned seven books and that is where I want to go, where I want to finish on seven books. But I can completely understand the mentality of an author who thinks "Well I am going to kill them off because that means there can be no non-author written sequels as they call them, so it will end with me and after I am dead and gone" - they would be able to bring back the character and write a load of ...
Ela também planejou o final desde o começo:
Jo: No, the last book is not finished, though I am well into it now.
Richard: But you have written the finale already?
Jo: I wrote the final chapter in something like 1990? - oh hang on - I wrote the final chapter in something like 1990.
26 June 2006 - Richard and Judy Show, Channel Four Corporation (UK)
No final, você também deve considerar que seu público-alvo era crianças e jovens adultos. Os livros "cresceram" com o leitor à medida que cada parcela se tornava um pouco mais madura. No entanto, mesmo Rowling sendo um planejador tão grande, é muito difícil planejar uma história indefinida. A história tem crescido ao longo dos anos com a série Cursed Child , Fantastic Beasts , e vários outros escritos curtos sobre Pottermore. Você tem que explicar o que o criador quer fazer, ir aonde eles querem que a história vá ...