Structure. It is kind of strange to be discussing this prior to plot or idea but hey, I am flexible. You can read the discussions in any order you like. Structure refers to the way you organise a book such as chapters and the order of information. An editor who performs “structural editing” service on your work will read it to tell you how well your story or information is structured. In other words, where your chapters go, how many there should be and if you have put material that’s in Chapter 1 in Chapter 42 by mistake.