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Is it possible to set up an online experiment that involves two participants in the same session and record their responses?

Is it possible to set up an experiment that involves two participants in the same session and record their responses?

If you mean where two or more participants can interact, we had a demo from Costi Rezlescu about https://www.testable.org/ at this year’s ATSiP conference which involved some interaction. I’ve not seen that feature elsewhere before (though if you don’t care about timing or animation then it would be fairly easy to write something in PHP/MySQL.

Thank you very much, I will check on that.