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ELECTRE is a multi-criteria decision aiding methodology widely extended in many fields of application, such as environmental risk assessment, systems evaluation or analysis of financial management actions. The ELECTRE-III-H method generates a partial pre-order on a set of alternatives at different levels of a hierarchy of evaluation criteria. This method models the decision maker’s preferences using three parameters on each of the intermediate criteria of the hierarchy. These parameters must take values depending on the positions of the alternatives in the partial pre-orders. For a non expert user, the definition of those values is not trivial. It requires a deep understanding of the underlying method in order to assign the appropriate values. In this work, some assisting tools have been designed and implemented to help the user to find the most suitable values for these parameters. First, some initial sets of parameters are automatically calculated by the system for some predefined common preference models. Second, the user has several tools to explore the space of possible values starting from these initial ones. The system also generates several graphics that display the results obtained using different parameters, so that the user can easily identify which ones represent his preferences.
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