[throwaway729]

I feel like knowledge is one of those "I know it with I see it" type things. It can be assessed, but not systematically via a multiple choice standardized test. Which puts a lot of trust in the judgement of teachers.

Not exactly a politically viable solution in America.

[halspero]

"I know it with I see it". Yes indeed. One has to interact with a person to know that he knows stuff.