When there’s a knock at the door, some kids have an excited inclination to run over and see who it is. Teach them to curb this urge so they don’t accidentally let in a stranger. Kids should never unlock or open the door for anyone, especially if they are home alone or unsupervised. Turning the lights on, sounding alarms and not letting themselves be seen are good steps they can take instead.
Guardnow recommends not only teaching kids how to react to a stranger at the door, but testing them on it. Test your kids. Drill it in their head. Have someone come and ring the doorbell to see if they do what you tell them. Keep up the training until they pass the test.