on 24 October 1998
This book is a classic in its field. It covers performance analysis for computers, but is very easily extended to any area of performance analysis. It covers some theory, but mainly tips and "stories around the campfire" from those with a great deal of experience in the area. And that's actually more valuable than pure academic theory. The math is not too bad. One great feature is that you can focus on only those areas that you are concerned about and you can go as in-depth as you want. It's also true that it will never become obsolete (although some examples might be).
on 10 June 1999
This book is the most impressive performance assessment, modeling and simulation text I have read. It is a perfect balance of systems analysis and the necessary mathematical foundations that are extremely important to fully understand the disciplines Jain covers in this text. I have used this book numerous times for capacity planning projects, simulation studies, statistical analysis and for a guide in delivering presentations and writing papers.