It is simple to rate this book: everyone should own and read a copy! Yes, it's a Java tome, in a Java series; but it happened that as I was reading it, I was working on a UNIX shell script test harness (which, of course, is software, just like anything else) and thought I'd try to apply the lessons presented. My testing code was finished more quickly than I expected, was better designed than I had hoped, and was more elegant than I thought I could write, all because I applied the principles articulated herein. What's not to like? I can hardly wait to try it on Java code!