In the field of optics, a prism is a transparent object with at least two angled sides that break up white light into its constituent colours(1). In the same way that a single beam of light is in reality made up of different colours, the systems-based approach to risk analysis proposes that risk is likewise composed of different elements. These individual elements in turn are combined into a range of subsets, each associated with a range of different probabilities(2, 3).
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