vulnerability assessment

The first three chapters of your book covers physical design, vulnerability assessments and security surveys/audits.  Your discussion subject of this week is what did you find most complex or perplexing about vulnerability assessment? What peeked your interest the most? What can you do comfortably and what would you have trouble with?

Please make sure you have an initial post (about 300 words) and a comment/post to one of your friends' posts. Each discussion assignment is 5 points.