Scenario 2 - Human Evaluations
  - An authoring tool (that does evaluation and repair) captures human
    assertions about conformance of content. Examples: 
    
      - The alt-text of image x is good.
 
      - Image y does not need a longer description, the alt-text is all it
        needs.
 
    
   
  - Next time the tool is used to evaluate the content, the human checks do
    not need to be performed again.
 
  - The content and human assertions can be passed to another tool and the
    human checks do not need to be performed again.