One way to think of QV&V is as a contiual loop of: Observe, Analyze, Act.
- Observe your surroundings (what has changed)
- Analyzing what you "see" (what has been done so far)
- Acting on this information (address new issues, communicate changes and continue the task)
The most important aspect of this to me is: Trust, but Verify. As the old idiom goes, "Fool me once, shame on you; Fool me twice, shame on me"