The detailed calculations and discussions of methodology in this book far exceed those presented in the typical quantum mechanics book. This book, along with the book Quantum Mechanics Demystified (these two books are a superb complement to one another and should used together), should be required accompanyments to any quantum mechanics book. While almost all quantum mechanics books give an adequate discussion of the basic Schroedinger Equation and its applications, they are usually flops insofar as matrix mechanics are concerned, especially in the case of angular momentum. These books more than makes up for that. I personally am using this book and Quantum Mechanics Demystified to review a subject that I studied more than 40 years ago and find it to be very clearly written, making it more than adequate to overcome some very substantial holes that were not covered by my previous books. The authors should be well pleased with their work.