Giving dancers notes (or corrections when calling the thing by its name..), is probably the most overused, misused, lazy and abused working tool. it's a simplistic way to gain and maintain authority, and it reduces dancers into childish execution machines. I think that if a coherent choreographic system is in place, it will naturally guid the dancers, without stripping them down from their individuality and without dismantling their power position in the situation. I find the most effective note to be 'it's not clear, try again, or try something different'.