"This manual introduces the reader to the principles and practical tools of crisis and emergency risk communication (CERC). Principles in this manual adapt (1) writings of classical rhetoricians; (2) a wealth of modern crisis, issues management, communication theory, and psychological theory; and (3) lessons learned from the real and often painful world of experience, old-fashioned trial and error. CERC addresses a number of topics critical to successful public, partner, and stakeholder communication during crises and emergencies. This is not intended to be an in-depth manual on risk communication, issues management, crisis communication, or disaster communication. It is an amalgamation of all of these, incorporated from theory and practical applications. […] CERC is the attempt by public health professionals to provide information that allows individuals, stakeholders, and entire communities to make the best possible decisions for their well-being during a crisis or emergency. CERC includes communicating to these groups regarding decisions made by response organizations within nearly impossible time constraints. CERC principles teach us to accept the imperfect nature of choices as the situation evolves."
Centers for Disease Control and Prevention: http://www.cdc.gov/