Here's a link from Jérôme, if you wish to test the survey:
Dear Dario,
Just to let your know that I've moved the research landing page from http://meta.wikimedia.org/wiki/Research:Dynamics_of_Online_Interactions_and_... tohttp://meta.wikimedia.org/wiki/Research:Dynamics_of_Online_Interactions_and_... whose title is presumably more informative.
Then, if you receive any requests from RCom members who would like to actually try the survey before giving an opinion, please feel free to point them to this test url that I generated specifically for that purpose (but please, tell them to keep it confidential :) ): http://grebdioz.sciences-po.fr/limesurvey/index.php?sid=57263&newtest=Y&...
By clicking on this url, RCom members can perform the study just like in real conditions, except that they will not be able to see the results page at the end (where a participant's earnings in each section and final earnings from the study are normally displayed along with the choice to donate it to the Wikimedia Foundation).
Best,
Jérôme.