This slideshow ‘ is a great summary of a very important concept.
Librarians have information literacy very high on their agendas. Part of IL is how to evaluate material found online – this is an important part of both scholarhip, and lifelong learning. The existance of pre-prints and non-peer reviewed material in repositories is something that often gets highlighted as questionable, rightly so. When explaining how to evaluate online material, some of the characteristics of repository material wouldn’t always fit into our ‘safe’ categories. The ‘matrix of authority’ that Laura Cohen is pointing out is a step in the right direction, bringing in additional criteria for evaluating material.