ABSTRACT
This chapter presents two broad types of risk assessment models, single-tiered and multitiered models, noting that most models hitherto have been single tiered in an important sense. It offers a multitiered system of analysis which takes account of human values and risks to them in multiple scales of space and time. The chapter explores one particular approach to a pluralistic, but integrated, system of value, an approach which uses scalar determinations to locate the range of application of the multiple decision criteria. Talbot Page’s argument is applicable to risk assessment, which might employ one criterion in cases of risk to human health and welfare, and another, intergenerationally sensitive criterion to cases of risk to ecological systems. If ecological risk analysis is to be implemented in the foreseeable future, it will have to introduce some nonwelfare and nonutilitarian values and principles into the analytic framework of risk assessment.
