Abstract
This chapter has two aims: first, to draw together in a unified theory of public health reasoning the various theoretical components examined separately in earlier chapters; and second, to examine the implications of this unified theory for the practice of public health. At the heart of the theory proposed in this book are two main modes of reasoning – systematic reasoning and heuristic reasoning. These modes differ in their level of internal complexity, and each marks a unique achievement in human cognitive evolution. Systematic and heuristic reasoning operate under specific practical and epistemic conditions. They also embody different logical mechanisms and achieve different goals for the cognitive agents who use them. These additional features of these modes of reasoning are made explicit in the theory through contextual, cognitive and logical specifiers. As a test of the plausibility of this theory, it is used to explain features of a significant event in the public health of the UK, the emergence of BSE in cattle. Of course, to be of value to the field of public health, this theory must be more than an exercise in abstract, theoretical reflection. It must serve to influence or change how aspects of public health are conducted. The chapter discusses the implications of the theory for public health communication and for the use of expert reasoning during the deliberations of scientific committees. In both areas, the theory can be used to challenge assumptions that underlie these practices and to motivate new ways of thinking about these practices.
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Cummings, L. (2015). Theory of Public Health Reasoning. In: Reasoning and Public Health: New Ways of Coping with Uncertainty. Springer, Cham. https://doi.org/10.1007/978-3-319-15013-0_8
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