Children should put the food on their own plate, clean up after themselves and even do the dishes. Not because it saves the school money on workforce but because it is a part of growing up and learning about responsibility. What 21st century schools should be doing as well is growing their own fruits and vegetables where students water them and learn about nature. Setting up a farm to feed students would be optimal, but if that is not an option (for example in big city schools) then they can at last set up a windowfarm in some of the school windows.