| 1. Critical is a qualitative or quantitative description used to emphasize the importance of a resource, process or function that must be available after a disaster has occurred. The availability may either be keep constantly operational or made available at the earliest possible time upon activation. |
2. A qualitative description used to emphasize the importance of a resource, process or function that must be available and operational either constantly or at the earliest possible time after an incident, emergency or disaster has occurred.
(Source: SS540 Singapore Standard on Business Continuity Management - SS 540:2008)
(Source: Business Continuity Institute - BCI)