When I started offering professional book editing services, I had no idea there was more than one way to edit books. My entire thought process was, “Okay, let’s put those long-unused revision skills to work.” Later, I learned that at least four different editing styles are used during different stages of the book editing process: developmental editing, line editing, copyediting, and proofreading (see the definitions below). Now, I understand that I can help my clients achieve their goals as a developmental editor.