Emergency communication system
The Partnership for Public Warning states, “A single warning is frequently insufficient to move people to action, especially if it cannot be confirmed by direct observation. For most people the first warning received captures their attention and triggers a search for corroboration, but cannot be relied on to elicit the desired behavior. Scientific research supports the common-sense observation that people are disinclined to risk being fooled by a single alarm that might prove false or accidental. Effective warning requires the coordinated use of multiple channels of communication.” This basically means that when people get a first warning, they want to look for more information about the emergency before they do anything about it. By having many ways (which all work together) of sending a warning, people will be more likely to react to it in the best way.