...Every workplace I've had here seems to have this trait and every foreigner here has noticed it too, so I don't think we can chalk it up to certain individuals at one person's school...
Yeah, the last minute thing is very common, and pretty annoying, and probably happens for a number of reasons, including what the above posters have mentioned.
And while I agree that it seems to happen far more frequently here in Korea than in many other places, I think that as foreigners, we are more sensitive to it than we normally would be back at home.
Because of the whole language thing, I like to have everything planned out for my lessons, my day trip and holidays etc etc. When something happens to interrupt those plans, its a bigger deal, and so I notice it a lot more than at home.
Also, because I can't read Korean very well, the inter school memo system is useless to me, as are all the handouts I get, and the Monday morning staff meetings in the office. I feel that people just sometimes forget that I don't know whats going on despite all of that due to my horrible horrible illiteracy.
Chances are,
someof those changes that seem so very last moment in reality weren't.