[measuring ephemerality]

I've just been asked my opinion of how I might evaluate online work (in the sense of student creative projects). Hrm. That's a tricky one. How do you measure ephemerality? An essay might be required to be 2000 words, that's easy to count. But what do you do with an online project? Do you count the lexia? Do you look at the source code? Do you take into account how long it takes the reader to navigate through the work? I wonder if there are any guidelines out there from people teaching online (new)media/literature/poetry courses. I've found a few course descriptions but not many guidelines for evaluations. I wonder if educators are finding a paradigm shift of grading/evaluation occuring now as more and more students have access to computing technology and more and more educators are employing online lessons and themes into their teaching. In online creative work (I'm thinking of hyperfictions, hypertext essays, database-driven art etc...) do we only consider the finished product or as teachers, are we to take into account the hours of coding that went on behind the scenes to create that one node? As David Silver says: "Hypermedia projects are not just read; they are viewed, heard, and felt. At the expense of employing a cliché, they are experienced." So how do we evaluate student work on all these levels?