I am 100% of the opinion that it is wrong and unethical for a teacher to leave his or her studio and open up nearby. (But as we all know it happens all the time. It's also clearly wrong to murder someone. But the fact that something is wrong, sadly, does not stop some people from doing it anyway.) Of course I hope it never happens to me, but if it did I would of course be upset. But I wouldn't be extra upset on top of that just because I think they may have copied down addresses and/or phone numbers. Teachers probably know their students' last names, and there's a little thing called the phone book that makes all the info they need readily available. the real insult would be becoming your boss' competititor. The means of getting that news out, to me, is beside the point.

That said, and back to the point, no matter what guidelines and Dance organization lists, the law of the land rules, and in my state, you cannot have a no compete clause. Putting it in would void the entire contract. Anyone who wants to include one needs to speak to an attorney, not a studio owner on an internet board.