During working time, children may use the bathroom without requesting permission. But during circle time, group activities or outside playground, children request to be excused to use the bathroom. They need to knock on the door first to make sure if anyone use the bathroom. When the bathroom is available they precede in, close the door and help themselves in the bathroom. When finished, they need to flush the toilet, wash and dry their own hand using paper towels. Then dispose of them into trash.