Who is the target audience? beginners, intermediate or advanced? Something I have found in common with many of the thicker books (400+ pages) that I liked is t

Who is the target audience? beginners, intermediate or advanced? Something I have found in common with many of the thicker books (400+ pages) that I liked is they are broken up into a couple of very distinct sections. The first part is usually an intro and explanation of the material. The middle is more elaborate examples of how to use the materials. The back is more of a reference section. Something that drives me crazy is when books skip steps. Don't assume that the reader knows what the middle step is just because it's mentioned in chapter 2 doesn't mean I'll remember it when I get to chapter 9. Or 6 months later when I am looking at the book trying to remember how to do something. It's a book not mysql you can have something in more than one place.