I don't think I can be convinced that this is a good a book as it should have been given the potential wealth of material that is presented. I has a great deal of material, and admittedly some good, but it is poorly presented, indeed if I did not know better I suspect it is a collection of notes and washed out diagrams that really don't tell a coherent narrative concerning real-time. If you have a UML expertise, and are willing to do some digging on real-time systems you could probably get by without this book or buy it for some of the reference material but don't expect to get a good read.
What appears to be missing is some consolidation of what the subject is about, there are tables scattered through the book, but it is impossible to cross reference and most often there is no definition of an attribute or parameter is, and in this sense you are left asking the question - so what?
Apart from the above comments, it is poorly bound (Addison Wiley),mine began falling apart soon after buying it and most annoying it does not stay open so, pressing down to keep the blasted thing open just breaks the spine....but wait there is more - and this is a first. This is the first book that I have every read that does not have page numbers - yep not a single page number, yet the index references the page numbers. So if you have spare time and you want to find something that is in the index, you have to go to the table of contents, and look for something familiar and then track down a figure diagram, and trace back that way - better still just don't buy this book.