Book Series

Hey!

I really enjoy your books, but I wonder how you choose to make specific books a series. Do you decide that the book will be in a series before you start writing it, or do you just decide to turn it into one since you have so many ideas? (Series like the Ungifted Series)

Also, the Swindle series is one of my favourites, since it was the first series I ever read from you. Will it be getting any more books? 😀

Thanks for being such a good writer!