I was looking for a book for teaching myself ActionScript. I'm an advanced user of Flash 4, but Flash 5's ActionScript was cumbersome for me. So I buyed some books, and this is by all the means the best.It starts with an intermediate level. The explanations are clear, and my only complain is the absence of a CD, but you can always download the code from their web.If you consider yourself an intermediate user of other script languages and want a solid foundation in ActionScript, buy this book. If you have no previous experience, buy the Foundation ActionScript.I also own from the same Editorial Flash 5 Studio and Flash 5 Dynamic Content Studio. All of them, five stars books!