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.
Totally Terrific in Texas: Sound Check & Body Check Charts I like the sound check part instead of voice level.
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Twinkl Resources >> Voice Levels Wall Chart >> Thousands of printable primary teaching resources for EYFS, and beyond!