@NickStauner a large error rate among system task performers, a failure of system participants to get better over time doesn't imply that experience is helping to navigate the system. I'm not sure you've really proven your point here. –  Chuck Sherrington Jan 2 '14 at 13:33
True; With the right amount of experience, professionals in tax, law, and medical coding navigate these concepts just fine does. ;) What you just quoted could result from a particularly steep learning curve too though, so you can't rule out complexity as the problem just because few or none have navigated it. My point is that you can't really prove your point (that your phrasing is necessarily more suitable), so it might boil down to a trivial distinction, especially if the original question applies reasonably well to both ambiguous and complex (somewhat synonymous!) systems. –  Nick Stauner Jan 2 '14 at 13:55