Analysis of information sources in references of the Wikipedia article "Accident" in English language version.
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1. a short, sudden and unexpected event or occurrence that results in an unwanted and undesirable outcome ... and must directly or indirectly be the result of human activity rather than a natural event. (Hollnagel, 2004:5). 2. Accidents are the result of technical failures, human errors or organisational problems (Hovden, Albrechtsen and Herrera, 2010:855). 3. An accident as an unplanned and uncontrolled event in which the action or reaction of an object, substance, and person results in personal injury or the productivity thereof (Heinrich, 1959).
1a. an unforeseen and unplanned event or circumstance. 1b. lack of intention or necessity : chance. 2a. an unfortunate event resulting especially from carelessness or ignorance.