BBC News produced the chart as part of an article looking at the English you could ensure that you got crucial tasks done and could then skive off work to watch the World Cup mid-afternoon. Given time zone differences and team performance, that may well be less of an issue for Australians right now. However, remembering that any given task can be ranked on this scale is always a useful way of setting priorities when you're being assaulted with multiple requests from every conceivable direction.
What people often find hard to embrace is consciously deciding not to do something: if you have an embedded work ethic, that can feel like slacking. But having an overwhelming set of tasks on your to-do list does nothing for productivity: as we've pointed out before, setting priorities means dumping stuff as well as doing it.