Behaviour display and classroom rules

I use these resources as a incentive for positive behaviour in the classroom. Class rules are displayed and talked about. The children get a 'treat&' in the jar when they are seen following our class rules and being a good role model. I use it alongside the reception teacher to create competition between the classes. We usually say that is they jars are filled by a certain date then we get a class &';treat' i.e baking.