(In the Cisco program, you're given the task of fixing a broken router. If your process is reasonable, and if you can articulate it, then you pass the test, maybe even if you don't fix the router. This emphasizes that even a skilled network engineer and appropriate heuristics can be fallible; you might not have fixed the thing because you were unlucky. On the other hand, if your process is not reasonable or you can't articulate it, then you'll fail the test, even if you fix the router. The issue is that even an incompetent engineer and an unreasonable process can be lucky, but we'd just as soon not depend on that.) www.developsense.com/2007/12/why-i-am-not-yet-certified-eurostar.html