I have multiple sets of rules. There is a set for the classroom, hallway, bathroom, bus, and recess. Each rule falls under an expectation, be safe, be kind, be responsible.
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Give your classroom organization and order. Classroom structure gives children a sense of calm and grounding as the begin to develop an understanding of order in their environment and using both photos and icons is a great way to make visuals accessible for diverse learners. You can also add the "children figures" to give kids a visual understanding of how many children are allowed in each area at a time to help minimize conflict.