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This is actually more or less a direct quote from the Wikipedia page aimed at teachers ... the information is useful, but it's also a good example of not making it clear when you're quoting/paraphrasing/using your own words.  If you want to use this page, you should remember to go back to the original source ... which is linked from here. 

Very early (probably earliest) paper discussing wikis for students (pre-wikipedia)

pdf; no supporting research; just one persons experience.

Interesting approach for assessment.