The Book Interchagnge Tag Suite (BITS) is a book model based on the JATS article model. There are many things that can be structured the same way in both a Journal Article and a Book (or a part of a book), and some things that are very different. We'll review the things you 'get for free' if you are already familiar with the article model, and what parts of the book model you will need to pay a little more attention to.