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We develop and simulate a dynamic model of investment in information security. The model is based on the recognition that both IT managers and users appreciate the trade-off between two of the fundamental characteristics of information security, namely confidentiality and availability. The model's parameters can be clustered in a manner that allows us to(More)
This paper addresses the question of determining the optimal timing of interventions in information security management. Using utility theory, we derive the limiting condition under which, given a potential or realized risk, a decision to invest, delay, or abandon can be justified. Our primary focus is on the decision to defer costly deterministic(More)
We develop and simulate a basic mathematical model of the costly deployment of software patches in the presence of trade-offs between confidentiality and availability. The model incorporates representations of the key aspects of the system architecture, the managers' preferences, and the stochastic nature of the threat environment. Using the model, we(More)
The concept of stewardship in environmental economics is an established tool for environmental and natural resource management and the mitigation of risk from climate change. Similar concepts are well-established in accounting and management. Despite the ubiquity of the concept of stewardship, there is no generally accepted definition. We define the(More)
BACKGROUND Limited negotiation around care decisions is believed to undermine collaborative working between parents of children with long-term conditions and professionals, but there is little evidence of how they actually negotiate their respective roles. Using chronic kidney disease as an exemplar this paper reports on a multi-method study of social(More)
BACKGROUND Care of children and young people (children) with long-term kidney conditions is usually managed by multidisciplinary teams. Published guidance recommends that whenever possible children with long-term conditions remain at home, meaning parents may be responsible for performing the majority of clinical care-giving. Multidisciplinary team members,(More)