Partly in the questioner's mind, erm could be answered by reference to language problems, I mean, a technical or professional qualifications may be equivalent, and may be awfully good, but if one expert and qualified person can't talk the language of the country he wants to work in, that's going to be a barrier on its own, and I reckon that is often the bigger barrier between the easy movement of qualified people from one of our countries to another, than the lack of qualifications, or disagreement about qualifications themselves.