This is another past experiment. The idea was to have people interview each other, and assess each other's English skills. You would wait for someone to chat with, then you'd chat with them for 10 minutes, and then you would rate their English ability using the smiley slider.
This interface was used for a 1 hour pilot experiment where 3 oDesk people, including myself, interviewed 10 or so oDesk contractors, and they also interviewed each other.
I think the 10 minute time was too long. Apart from that, I'm not sure why this experiment faded away, and nothing more was done with it. I think my energies went into Talent Court shortly after this.