Ines, I have to ask: Where is it you work? Are you referring to the american certification?
There definately seems to me like there is a need for a worldwide certificate, with the internationalisation of the business and all. What a sommelier is, is quite diffuse. By tradition it's a trade learnt through practice but with the education available today it's hard to tell what means what.
For example, like I said before, I'm currently enrolled in a university programme for Sommeliers. I'll graduate with a Bachelor (or maybe Masters, not quite sure yet) in Culinary Arts with Sommeliere specification. This is one of three programmes in Sweden that grant me entry into the national Sommelier association. There are a multitude of smaller, say one month courses that are also called sommeliereducations. These however can not join the sommelier association.
Time to get ready for school, six hours of Rhône tastings is what's on the schedule or today.