2. Event, whether anticipated (e.g. a labour strike or hurricane) or unanticipated (e.g. a blackout or earthquake), which causes an unplanned, negative deviation from the expected delivery of products or services according to the organization’s objectives.

(Source: British Standard BS25999-1:2006 Code of Practice for Business Continuity Management)

3. Interruption of normal business operations or processes which can range from short term to longer term unavailability. For example, a fire which destroys the main plant facility disrupts the production operations until an alternate facility is established.

(Source: Singapore Standard 540 - SS 540:2008)

4. An event which interrupts the ability of an organisation to deliver its outputs.