This paper describes the implementation and use of risk assessment in the offshore industry in relation to safety aspects -safety to people's life and health, as well as environment and property. Although risk assessments may be based on both qualitative and quantitative methods, the main focus here will be on quantitative risk assessments (QRA). The development of offshore QRA has been lead by a mutual influence and interaction between the regulatory authorities for the UK and Norwegian

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... of the North Sea as well as the oil companies operating here. The experience from this area has been the main basis during the writing of this paper. # Safety Science 40 (2002) 231-269 www.elsevier.com/locate/ssci 0925-7535/01/$ -see front matter # 2001 Elsevier Science Ltd. All rights reserved. P I I : S 0 9 2 5 -7 5 3 5 ( 0 1 ) 0 0 0 4 8 -0 * Tel.