Communication during a crisis involves a broad variety of techniques which are intended to:

a. Inform the public, ensure people comply with demands from the government, dictate policies to be follower

b. Reduce impacts from events, inform the government, gather intelligence on terrorists or criminals operating in the community

c. Inform the public, Encourage preventative behaviours, and Limit the impact of adverse events

d. Inform decisions, tell people what to do, manage expectations