BUYERS BEWARE!!!!! If you think that you're buying the teacher's Guide for the Course Book and Workbook - YOU ARE WRONG! This book has NOTHING to do with them. I spent a LOT of money buying something I didn't need (or else could have bought on it's own without the other 2). It has NO ANSWERS to the coursebook! This is why I gave it such a low rating. Also note that you have to have an internet connection in order to use the CD ROM effectively. HOWEVER, it is a great book on it's own with good resources for teachers(I would have given it a 5 star rating on it's own). I think this product is a deceptive sale, as it is not in keeping with items such as Cambridge IGCSE Physics, where the 3 books are correlated. CAMBRIDGE UNIVERSITY PRESS - you seem to be just out out make money and are not providing your clients with the quality & consistency they are paying for. The "system" is not uniform and certainly not user friendly!