Crisis and Emergency Risk Communication is an approach to communicating effectively during emergencies. These principles are used by public health professionals and public information officers to provide information that helps individuals, stakeholders, and entire communities make the best possible decisions for themselves and their loved ones. CERC recognizes that during emergencies, we work under impossible time constraints and must accept the imperfect nature of our choices. CERC draws from lessons learned during public health emergencies and research in the fields of public health and emergency risk communication. The CERC program consists of 1) training, 2) resources, and 3) shared learning.