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What is Risk? Different perspectives and implications for risk management

What is Risk? Different perspectives and implications for risk management. Terje Aven University of Stavanger, Norway. PSAM9 Hong Kong. What is Risk?. What is risk?. History Obser-vations. Future. Present. Risk offshore platform. Mental construction?. Where is the risk?.

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What is Risk? Different perspectives and implications for risk management

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  1. What is Risk? Different perspectives and implications for risk management Terje Aven University of Stavanger, Norway PSAM9 Hong Kong

  2. What is Risk?

  3. What is risk? History Obser-vations Future Present

  4. Risk offshore platform Mental construction? Where is the risk?

  5. What is Risk?

  6. Merriam-Webster online Dictionary: • possibility of loss or injury   • someone or something that creates or suggests a hazard • the chance of loss • the degree of probability of such loss What is Risk?

  7. Scientific Risk Community: What is Risk? (A,X,P) A,X P,E (A,X,U) A: Event, X: consequences of A

  8. (A,X,P) P,E LNG plant

  9. LNG plant (A,X,P) P,E (A,X,U) Conclusion on risk acceptability, P ≤ 10-5 Risk reduction processes (ALARP) based on P and E

  10. Social scientist critique of risk assessments • Risk assessment consultants and the formal decision-making remain relatively unaffected Risk-informed decision-making, not risk-based

  11. What is Risk? P,E • Risk equals expected loss • Risk is the probability of an adverse outcome A: Event, X: consequences of A

  12. What is Risk? P,E • Risk equals expected disutility • Risk refers to situations with known probabilities for the randomness the decision maker is faced with A: Event, X: consequences of A

  13. Scientific Risk Community: What is Risk? (A,X,P) P,E A,X (A,X,U) A: Event, X: consequences of A

  14. Scientific Risk Community: What is Risk? (A,X,P) P,E A,X (A,X,U) A: Event, X: consequences of A

  15. What is Risk? (A,X,P) • Risk is combination of probability of an event and its consequences (ISO 2002) • Risk is a measure of the probability and severity of adverse effects • Risk is defined as a set of scenarios s of which has a probability p and a consequence c A: Event, X: consequences of A

  16. What is Risk? (A,X,P) • What is the meaning of P?

  17. Probability of an attack next year

  18. P(falling) 1000 m

  19. What is a probability? Relative frequency interpretation Subjective probabilities P(A|K) P* of P

  20. Jacob Bernoulli (1654-1705) From gambling to the real world Goal: Determine probabilities with a high level of accuracy Moral certainty

  21. What is risk? (A,X,P) Subjective probabilities Relative frequency interpretation (A,X,P,K) (A,X,P,P*,U(P,P*),K) Pf, P(Pf) – probability of frequency approach

  22. Scientific Risk Community: What is Risk? (A,X,U) Aven 2007, Aven and Renn 2008 Risk description: (A,X,U,P,K)

  23. Nassim N. Taleb • Mediocristan • (Normalistan) • Extremistan

  24. Uncertaintiesin phenomena and processes P(health problems | K) =0.01 Surprises

  25. Risk description P,E S U K

  26. Effect on Risk Management (A,X,U,P,K) • A broader risk picture • ”Mechanistic” use of risk assessment cannot be justified • More management involvement • Serve the industry? Society? LNG-plant

  27. ALARP • Risk shall be reduced to a level that is as low as reasonably practicable • ”Grossly disproportionate”, E[Costs] E[Benefits] U?

  28. What is Risk? ISO (2007) draft: risk is the effect of uncertainty on objectives Should we search for one universial perspective?

  29. Development trends • Broader risk perspective • Uncertainty assessments • Flage, R., Aven, T. and Zio, E. (2008) Alternative Representations of Uncertainty in Reliability and Risk Analysis – Review and Discussion. ESREL 2008 • Incorporating human and organisational factors

  30. Wiley 2008

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