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A railing accident at a Texas Longhorns college football game, spilling fans onto the sidelines

An accident is an unplanned event that sometimes has inconvenient, undesirable or even disastrous consequences, other times being inconsequential. The occurrence of such an event may or may not have unrecognized or unaddressed risks contributing to its cause. Most scientists who study unintentional injury avoid using the term "accident" and focus on factors that increase risk of severe injury and that reduce injury incidence and severity.[1]


Unintentional injury deaths per million persons in 2012

Physical and non-physical[edit]

Physical examples of accidents include unintended motor vehicle collisions or falls, being injured by touching something sharp, hot, dropping a plate, accidentally kicking the leg of a chair while walking, unintentionally biting one's tongue while eating, accidentally tipping over a glass of water, contacting electricity or ingesting poison. Non-physical examples are unintentionally revealing a secret or otherwise saying something incorrectly, accidental deletion of data, forgetting an appointment etc.

Accidents by activity[edit]

  • Accidents during the execution of work or arising out of it are called work accidents. According to the International Labour Organization (ILO), more than 337 million accidents happen on the job each year, resulting, together with occupational diseases, in more than 2.3 million deaths annually.[2]
  • In contrast, leisure-related accidents are mainly sports injuries.

Accidents by vehicle[edit]

Domino effect accidents[edit]

In the process industry, a primary accident may propagate to nearby units, resulting in a chain of accidents, which is called domino effect accident.

Common causes[edit]

Incidence of accidents (of a severity of resulting in seeking medical care), sorted by activity (in Denmark in 2002).

Poisons, vehicle collisions and falls are the most common causes of fatal injuries. According to a 2005 survey of injuries sustained at home, which used data from the National Vital Statistics System of the United States National Center for Health Statistics, falls, poisoning, and fire/burn injuries are the most common causes of death.[3]

The United States also collects statistically valid injury data (sampled from 100 hospitals) through the National Electronic Injury Surveillance System administered by the Consumer Product Safety Commission.[4] This program was revised in 2000 to include all injuries rather than just injuries involving products.[4] Data on emergency department visits is also collected through the National Health Interview Survey.[5] In The U.S. the Bureau of Labor Statistics has available on their website extensive statistics on workplace accidents.[6]

Accident models[edit]

Many models to characterize and analyze accidents have been proposed,[7] which can by classified by type. Notable types and models include:[8]

  • Sequential models
    • Domino Theory[9]
    • Loss Causation Model[10]
  • Complex linear models
    • Energy Damage Model[11]
    • Time sequence models
      • Generalized Time Sequence Model[12]
      • Accident Evolution and Barrier Function[13]
    • Epidemiological models
      • Gordon 1949
      • Onward Mappings Model based on Resident Pathogens Metaphor[14]
  • Process model
    • Benner 1975
  • Systemic models
  • Non-linear models
    • System accident[15]
    • Systems-Theoretic Accident Model and Process (STAMP)[16]
    • Functional Resonance Analysis Method (FRAM) [17]
    • Assertions that all existing models are insufficient[18]

Ishikawa diagrams are sometimes used to illustrate root-cause analysis and five whys discussions.

See also[edit]



Other specific topics[edit]


  1. ^ Robertson, Leon S. (2015). Injury Epidemiology: Fourth Edition. Lulu Books.
  2. ^ "ILO Safety and Health at Work". International Labour Organization (ILO)
  3. ^ Runyan CW, Casteel C, Perkis D, et al. (January 2005). "Unintentional injuries in the home in the United States Part I: mortality". Am J Prev Med. 28 (1): 73–9. doi:10.1016/j.amepre.2004.09.010. PMID 15626560.
  4. ^ a b CPSC. National Electronic Injury Surveillance System (NEISS). Database query available through: NEISS Injury Data.
  5. ^ NCHS. Emergency Department Visits. CDC.
  6. ^ "Injuries, Illnesses, and Fatalities".
  7. ^ A long list of books and papers is given in: Taylor, G.A.; Easter, K.M.; Hegney, R.P. (2004). Enhancing Occupational Safety and Health. Elsevier. pp. 241–245, see also pages 140–141 and pages 147–153, also on Kindle. ISBN 0750661976.
  8. ^ Yvonne Toft; Geoff Dell; Karen K Klockner; Allison Hutton (April 2012). "Models of Causation: Safety". In HaSPA (Health and Safety Professionals Alliance) (ed.). OHS Body of Knowledge (PDF). Safety Institute of Australia Ltd. ISBN 978-0-9808743-1-0.
  9. ^ H.W. Heinreich (1931). Industrial Accident Prevention. McGraw-Hill.
  10. ^ Bird and Germain, 1985
  11. ^ Gibson, Haddon, Viner
  12. ^ Viner
  13. ^ Svenson
  14. ^ Reason, James T. (1991). "Too Little and Too Late: A Commentary on Accident and Incident Reporting". In Van Der Schaaf, T.W.; Lucas, D.A.; Hale, A.R. (eds.). Near Miss Reporting as a Safety Tool. Butterworth-Heinemann. pp. 9–26.
  15. ^ Perrow, 1984
  16. ^ Leveson 2004
  17. ^ Hollnagel, 2012
  18. ^ Dekker 2011

External links[edit]


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