Relative difficulty of creation

Hi list members,

While researching approaches to lower the threshold of content production in applications driven by user contributions I was wondering whether research in the relative difficulty of creating content exists.
"Relative difficulty of creation" relates to the question what kind of tasks a user regards as more difficult than another. e.g. is it more difficult for a user to answer a question or to post it?
This relative difficulty might be specific to a particular user, so how can I asses it?
Are there any concepts old or new out there that would dare to create a hierarchy of relative difficulty? 
 
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