As part of the current blogversation on synopses, Justine Larbalestier writes on her experience with synopses and why it’s easier to do them before you write the book (my emphasis).
This is the part where I die laughing. Not a planner, me.
I guess I wrote a synopsis of the theater book before I wrote it: it was 50,000 words and took a month, and the book isn’t following it very closely.