"Not being able to make calculations, you miss the whole power of the theory" (freely quoted) is the statement in the foreword of this book. And this is the concept of it. You won't find long texts about the interpretations of Quantum Mechanics and maybe you will also miss the elegant, but difficult, concepts presented in the books of for instance Lifshitz/Landau. But you will find<br><br>a) A systematic scheme. You will learn about the origins, about the Mathematical Framework and then you go deeper and deeper in the Concepts of nonrelativistic Quantum Mechanics, including time-dependent perturbation theory and scattering theory. Zettili explains all in a very clear way.<br><br>b) Problems. A lot of problems. Those problems are the best thing in the book. They challenge you mind and they are good for a deep understanding of the subject. For around 1/5 of the problems (10-15 per chapter) there are also very good and clear solutions, something that is missing in most of the books I have seen so far.<br><br>I absolutely recommend this book to every beginning student in Quantum Mechanics, but also higher level student will benefit - you will find that you have often misses key points in the concept of QM and you will learn a lot of ways to tackle problems.<br>But I should also point out some disadvantages that you should be aware of<br><br>1.: It is a problem-solving book, I know. Nevertheless, a short introduction in the difficulties of interpretation should be in a QM textbook - just to make it clear, that there are conceptual problems in understanding.<br>2.: Most important: The mistakes. Maybe it is simply because this time I was really able to understand what the book is telling me - but somehow I have the impression, that there are more mistakes than usual. Not really much - but somehow, If you absolutely don't understand what the author is talking about, maybe the problem is the book, not you.<br>3.: Though in most of the cases the book is very clear, the chapter "Rotations and Addition of Quantum Mechanics" is difficult to read. It is a very technical chapter, yes, but nevertheless I think the author should have put really an effort in this to make it clearer<br>4.: The chapters of Many-Particles-Theory and Scattering Theory are quite short<br><br>5.: Not really a disadvantage, because it is outside the intended range of the books - but I really hope, the author will make also a book about relativistic QM.<br><br>It now may look like there are a lot of disadvantages - but don't fear it. In general, you won't notice them and it shouldn't stop you from buying the book - actually it is more like recommendation for the author.