Calis contribution to psychology is in my opinion huge. He brought psychology back to its original interest: the unconscious and he provided the means to investigate this field in a proper sense. The interest shifts from behaviour to process. We do not have to assume a black box, we can investigate the black box: what is going on inside. And this is a small kind of revolution in the field: stuying behaviour is an unfruitfull thing to do, because behaviour is in fact a free thing. Its another thing to conclude that some behaviour is not acceptable, and to have to say what to do about it. In my opinion this lies in another field of interest.