Incidence
The number of specified occurrences in a given place in a period of time.

Individual risk to life
The increment of risk imposed on a particular individual by the existence of a hazard. This increment of risk is an addition to the background risk to life, which the person would live with on a daily basis if the facility did not exist.

Intensity of disaster impact
In broad terms, number of deaths, physical and psychological injuries, and people rendered homeless by the disaster; scope of destruction and damage; effect on industrial and commercial productivity, and on employment; effect on human activities, and scale of donations, extra taxation and other financial reparations.

Involuntary risk
A risk imposed on people by a controlling body and not assumed by free choice of the people at risk. It has occasionally been defined to include post disaster response, then being equivalent to disaster management, as defined in this glossary.

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