R help - Jun 2014 - Online, automatic evaluation of class assessment R scripts

Dear R group,

I will be giving a course on R in a bit of time. I am very intrigued by the
way R coding assessments are done in several courses on Coursera and would
like to figure out whether I am capable of setting up such a system for my
course. On Coursera, R scripts are submitted online and then directly
evaluated so that students see the outcome and resubmit if necessary.

Is there anyone who is willing to share his / her experience with setting up
the corresponding environment (on a server) and writing the scripts? Or
point me to helpful information?

I am sorry if the answer is indeed already on the web but I might not have
found the right search terms. At least I was not able to find anything about
this. 

Thanks a million,
Werner
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