Quantified Societal Risk and Policy Making is the result of an international workshop on societal risk organized by the Dutch Ministry for Transport, Public Works and Water Management with additional financial support from the Directorate for Transportation (DG VII) of the European Union. Managing risks, whether there is a strong man-made or natural component, basically means assessing alternative options under uncertainty. The possibility of multiple fatalities is one of the factors that can vary between options. This volume is concerned with one particular type of risk - the risk of death of a number of people in one accident - and with one particular tool - probabilistic risk analysis - as they are developing in various domains of society nowadays. Generally, this risk is labelled societal risk. This book shows how such comparisons are shaped at present in various hazard domains, such as: flood protection location and physical planning of industry transportation of chemicals, and prevention of aircraft accidents. It examines how to represent aggregate risks from major hazards in ways that can be handled by policy-makers. The purpose of the book is to increase the awareness of societal risk, disseminate available knowledge of existing approaches, and exchange information on applications from various domains. Quantified Societal Risk and Policy Making should be of interest to all those professionally concerned with defining the optimal separation between hazardous activities and equally desirable developments nearby.

Risk communication: the evolution of attempts Risk communication is at once a very new and a very old field of interest. Risk analysis, as Krimsky and Plough (1988:2) point out, dates back at least to the Babylonians in 3200 BC. Cultures have traditionally utilized a host of mecha nisms for anticipating, responding to, and communicating about hazards - as in food avoidance, taboos, stigma of persons and places, myths, migration, etc. Throughout history, trade between places has necessitated labelling of containers to indicate their contents. Seals at sites of the ninth century BC Harappan civilization of South Asia record the owner and/or contents of the containers (Hadden, 1986:3). The Pure Food and Drug Act, the first labelling law with national scope in the United States, was passed in 1906. Common law covering the workplace in a number of countries has traditionally required that employers notify workers about significant dangers that they encounter on the job, an obligation formally extended to chronic hazards in the OSHA's Hazard Communication regulation of 1983 in the United States. In this sense, risk communication is probably the oldest way of risk manage ment. However, it is only until recently that risk communication has attracted the attention of regulators as an explicit alternative to the by now more common and formal approaches of standard setting, insuring etc. (Baram, 1982)."

Risk communication: the evolution of attempts Risk communication is at once a very new and a very old field of interest. Risk analysis, as Krimsky and Plough (1988:2) point out, dates back at least to the Babylonians in 3200 BC. Cultures have traditionally utilized a host of mecha nisms for anticipating, responding to, and communicating about hazards - as in food avoidance, taboos, stigma of persons and places, myths, migration, etc. Throughout history, trade between places has necessitated labelling of containers to indicate their contents. Seals at sites of the ninth century BC Harappan civilization of South Asia record the owner and/or contents of the containers (Hadden, 1986:3). The Pure Food and Drug Act, the first labelling law with national scope in the United States, was passed in 1906. Common law covering the workplace in a number of countries has traditionally required that employers notify workers about significant dangers that they encounter on the job, an obligation formally extended to chronic hazards in the OSHA's Hazard Communication regulation of 1983 in the United States. In this sense, risk communication is probably the oldest way of risk manage ment. However, it is only until recently that risk communication has attracted the attention of regulators as an explicit alternative to the by now more common and formal approaches of standard setting, insuring etc. (Baram, 1982)."

Quantified Societal Risk and Policy Making is the result of an international workshop on societal risk organized by the Dutch Ministry for Transport, Public Works and Water Management with additional financial support from the Directorate for Transportation (DG VII) of the European Union. Managing risks, whether there is a strong man-made or natural component, basically means assessing alternative options under uncertainty. The possibility of multiple fatalities is one of the factors that can vary between options. This volume is concerned with one particular type of risk - the risk of death of a number of people in one accident - and with one particular tool - probabilistic risk analysis - as they are developing in various domains of society nowadays. Generally, this risk is labelled societal risk. This book shows how such comparisons are shaped at present in various hazard domains, such as: flood protection location and physical planning of industry transportation of chemicals, and prevention of aircraft accidents. It examines how to represent aggregate risks from major hazards in ways that can be handled by policy-makers. The purpose of the book is to increase the awareness of societal risk, disseminate available knowledge of existing approaches, and exchange information on applications from various domains. Quantified Societal Risk and Policy Making should be of interest to all those professionally concerned with defining the optimal separation between hazardous activities and equally desirable developments nearby.