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.
This is pretty student-centered and I think it is a good idea to take the student's thoughts into consideration when there are issues, like Caleb from Tough Young Teachers. Self-evaluation worksheet to help monitor and have classroom management.
Outlaw "I'm Done!" I LOVE this post from Kady at The Teacher Trap. She makes some really good points and includes suggestions for helping kids change their mindsets about rushing through their assignments.