If you are interested in security and security metrics, I highly recommend reading Dan Geer’s chart deck on “Measuring Security”. It weighs in at a hefty 426 pages, but it made me laugh out loud in parts and go hmmm. Highlights include p. 108 on “Decision Making” says “*Rational decisions are not enough, *Need to also allow for your preferences”. I really like the model for “Tracking Performance” that he shows for selected security software on pages 154-156, but caution still needs to be applied and meta-information about the numbers is important for full understanding – did the product undergo extensive review one year? are the CVE’s equivalent to each other in severity? etc. Well worth a read and on my list for more more comprehensive study.
 Dan Geer, Measuring Security