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The problem is, unless you give everyone the ability to moderate all the time, not everyone will HAVE mod points - and as a result, only some students will get the ability to moderate, which is highly unfair if grades depend on these marks.
Conversely, giving everyone the ability to moderate cheapens the value of a mod point, and in some cases, still won't solve the problem - once a comment is as highly rated as poss
This means that one can trust the moderation to some extent and even give students marks based on how well their comments have been received by their peers.
However, it is of course a problem that some students may not have mod points. And losing the ability to post is a serious problem.
We have actually had major problems getting slash running at all (so I can't comment/play with your proposed solutions yet). I don't have root access at uni and this makes installation of all the prerequisite packages much harder.
Also, does slash require a dedicated web server? I recall from the docs that you need a special apache setup.
In any case, we have been experimenting with PostNuke as well. I don't think it's moderation is advanced as Slash's, so if we use it, we probably can't take the results of the moderation seriously for marking.
P.S. We have recently set up a PostNuke site for the discussion of innovative computer science ideas. See:
http://cgi.cse.unsw.edu.au/~papers/PostNuke/html/i ndex.php [unsw.edu.au]
If you like postnuke, and want to see the project that most of it's tallent left PN to go work on, check out Xaraya [xaraya.com].
The whole point after all is to stimulate discussion and help comp3141 students prepare for lecture. Whether or not some of this discussion is done by non-comp3141 students is beside the point. The goal is to present the best discussion possible on an upcoming lecture.
I'm not sure whether this would have any implications with respect to the moderation. It may be ok
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