Every book has a structure that should be understood. There is a difference between a pile of bricks and a single house. A book is like a single house. It is made up of different rooms, sizes, shapes, outlooks, uses. Each major part has an amount of independence.

Practical books tell you how to do something you want to do or should do, along with an argument for the right way of doing it.

Consider if you are reading a novel, a play, an expository work. It may sound simple, but it is not. For example, is Gone with the Wind a romance or history of the south?