The CHOP has been designed as a community intervention trial that compares three different school-based intervention strategies aimed at teaching to families how to prevent food choking injuries in children, together with the basics of food safety. The choice of employing such study design is motivated by the facts that community intervention trials allow to reach as many people as possible regardless their risk of experiencing the outcome of interest and to inform policy-makers on the effectiveness of an intervention on a community basis instead of an individual basis.