Abstract
In this chapter, the model used to measure and maximize IS availability is described. The method of selecting independent variables will be presented, with a detailed definition of each variable in the model. This section presents a model based on Bayesian network, utility theory and influence diagrams. Finally, a method for probability elicitation through an interview with domains experts will be described, as recommended data collection model, for cases where it is not possible to set parameter' values based on learning from data.
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