What counts as acceptable justification in each AoK?

• The Arts:
• An award, for the piece of art ( Example: Saying the musical Hamilton has the best music would be justified by the fact that Hamilton won Best Musical Theater album at the 2016 Grammys- though one could still argue the award is subjective..)
• Maybe also price, if it's on the market ( Example: A Van Gogh went for what would now be 83 million dollars in 1987.  I hope someone wouldn't be paying that much for something they thought was terrible...)
• Ethics
• As long as it doesn't hurt anyone else (This is probably kind of questionable, because if you think life begins at conception, pro-choice would be hurting someone else)
• History
• Facts, from multiple sources, preferably primary souces
• Mathematics
• Proofs, which require logic to be true
• Human Sciences
• Personally knowing a person (though this not might be the best, given the number of people when interviewed about those who commit mass murder, and say they though the person was perfectly normal)
• Experience (definitely not perfect, generalizations always have acceptions) 
• Natural Sciences
• Results from an experiment that had repeated trials, and is repeated by other researchers
• Religous Knowledge Systems
• If one believes in a set of assumptions that can't be proven or disproven, someone could use those as acceptable justification (but someone who doesn't believe it would argue the fact that it can't be proven means it can't be used as a justification)
• Indigenous Knowledge Systems
• What happens in the world around them, that may have been caused by the system they believe in
• ..... sorry, I'm not sure I know what an indigenous knowledge system is....

These are supposed to be acceptable, not perfect justifications.  But if you have something better (and you probably do), comment! Unless you already wrote it on your own blog.  But you could still repeat it, if you want.