I don't know what the legislation in every country is either.
I have no shining examples.
That said, the United States has done very well in terms of predictability. They identify products through the use of an Export Control Classification Number, or ECCN. Export restrictions for certain countries are also indicated.
For example, ECCN X cannot be exported to country Y because of this and that.
In terms of transparency, it's a good example. The United States may not be a shining example, but the main industry issue is that our export control system needs to be harmonized with the United States' system to facilitate trade between the two countries. It would also be useful if the systems on both sides of the border were exported beyond North America.