"5 authors on the paper? why, that's clearly a fifth of the work and worth only a fifth of a publication for your tenure case." There's a useful and growing set of documents about assessing digital scholarship in the humanities (see http://www.mla.org/resources/documents/rep_it/dig_eval for instance), but there's less discussion of how to assess co-authorship. Lone scholarship is so deeply entrenched in humanities culture that even the best arguments won't likely carry much weight until major, recognized organizations make statements about it. It's certainly been my experience that coauthored papers are rarely less work than single authored papers, and in many cases more work. Even if the words/author ratio is lower in some cases (depending on how the work was done), there's also a lot of coordination and refinement that needs to happen, not to mention (maybe even more importantly) the depth of the background work that made the article possible. Personally, I just enjoy co-authorship more and I think what's produced is better. Actually, all of my work is collaborative, so I don't really have much choice in the matter.
Anyway, a colleague asked me if I knew of any resources to point to for assessing co-authorship in the digital humanities, and I have nothing solid at hand. I'm hesitant to adopt outright models from other disciplines (e.g. computer science), because – at the risk of sounding exceptionalist – I think some aspects of digital humanities research are fairly unique.
Can anyone point to helpful guidelines for assessing co-authorship in the digital humanities?