A(n) is the process of accounting for all personnel—that is, determining each individual's whereabouts—during an emergency.

headcount

Explanation:

A headcount is the process of counting all personnel during an emergency, like a building evacuation due to fire for example.

The strategy for the headcount procedure will vary from company  to company, based on their location (is it a floor in a highrise building or a single isolated building?), the number of people in the company (are they 5 or 5000?).

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