I'm not disappointed with the purchase, just, I expected to find something else ... the technical, a little technical advice! It is not so, it is for me a small net philosophy book. I still find it nice and that's why I give still some stars. The problem (and advantage) is that it only reinforces me in the ideas that I have for a little more than 10 years when I created a first fluid site !!! (Already manufacturing a fluid site at the time, almost everything is solved for what happened then!) Get this book you if you are messy or if you are new. Get this book if you, though experienced, you want to restructure you and get you involved. Get this book you if you want to gain a good basic method, regardless of the site you want to achieve, and whatever its destination (PC home, office, tablets, cell phones). But do not buy this book to learn the technique of adaptive! then you may be disappointed! These are just concepts, albeit essential, to achieve the adaptive (adaptive French), but insufficiently explained to my senses! Anyway, I liked this book!