We want to teach our children how to make wise and safe decisions. We teach them now so they can make decisions in the future without us. Take a deep breath and calm down before correcting a child. Being upset, yelling, or using a loud voice tend to block a child's listening skills.
Eye contact helps communication.
Bending down is less threatening to a child and helps a child listen better. Speak in short sentences. Long lectures and lots of words can cloud the issue you are concerned about. Tell the child what you want them to do, not just what you see wrong. Children don't always know what you expect of them.