In order to increase the chances of survival of victims of out-of-hospital cardiac arrest, rapid response is essential. The vast majority of sudden cardiac arrests (SCA) do not occur in hospital. Raising public awareness of cardiopulmonary resuscitation (CPR) is a principle that has been in place for the last ten years. The creation and development of a network of first responders in French-speaking Switzerland is an illustration of this. The Kids save lives project promotes the training of children in CPR so that they too can recognize, call emergency services and provide first aid in an SCA situation.