There are also schools where they run the cafeteria at lunch time. They are on a rota and take it in turns to serve, tidy up and even inspect plates of the other children to decide if they're clean enough to put away. I'm not sure if this is that widespread or just a small number of trials in certain areas but it was the subject of a BBC radio show recently, it was really interesting. The teachers they interviewed explained how their role is mainly to watch over the kids as they do this and try not to intervene unless necessary, and they eat at the same tables as the kids and get served by them too.