Adding Ajax Book does not require you to start from the beginning and read it all the way to the end. I’ve tried to make each chapter as standalone as possible. Having said that, there is some small degree of building on a previous chapter’s work, primarily in the use of an Adding Ajax library that is created as the book proceeds. However, all of the material is included in the downloadable examples. I would, however, recommend that you read Chapters 1 and 2 before you read any other chapters.