Thanks for the feedback, I was originally very exited about the possibility to have qualification tests for the workers, but it turned out that the quialification tests do not support the "external question" type that I use to implement interface in this HIT. Take a look here:
It saysI might be mistaken at this point, and will need to dig more into this issue. For now I am thinking of granting qualification based on the current performance of the workers, and then paying more to workers with qualification.You can only use an external question as the question of a HIT. You cannot use an external question with a Qualification test.