Very briefly on the definitions, there are seven provinces in Canada that define psychological harassment and in seven different ways. The more it's complicated, the more the professionals who will be hired will be lawyers. If it's open-ended, there will be people who try to prevent the problem. I would really go for a broad definition and let the specialists who can actually intervene in workplaces to make them better workplaces have the wiggle room necessary to actually improve what's going on.
Quebec has the most technical definition in the world, as far as I can tell. There are six elements to it. There are thousands and thousands of litigations going on because of that.