By Colin Dunbar
Naturally, the quality of the content of your book is the number 1 priority. But when you format your book, the layout of your content, structure and readability is just as important as the content itself.
Readability is an interesting topic, and there are a number of readability formulas that can be used to test the readability of text. You can read more here: http://en.wikipedia.org/wiki/Readability.