I use a stop light system. My hubby made one out of wood (some teachers use poster board and laminate). I have clothes pins with their names on it and they of course start in green. I color in their stop light at the end of the day (later in the year they do it). This sheet stays in the B.E.E books (take home binder) and is initialed each night by the parents. There is a place for their comments as well. I attached a copy of what I use and maybe this will help.
