This voice levels poster is used in most preschools during my placesment, I think it is an effective way for teachers to control the voices in the kinder. Child also remember the colors and related voice levels that they should use inside and outside.
reward whole class behavior. I have a cut out of a jar taped to my whiteboard. There are also a bunch of magnetic gems. When the class WOW's me, I add a gem to the class jar. When the class fills the whole jar, I let them vote on their class reward.