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@. Biographies and . Dr, Gérard Dray : is an assistant professor at the engineer school Ecole des Mines d'Alès France. He had a Ph. D. in 1992 in automatics and computer systems from University of Montpellier II France. His areas of interest concern knowledge discovery from data and data mining based on fuzzy set theory

@. Dr, Michel Plantié is assistant professor at the engineer school : Ecole des Mines d'Alès France He received a Ph. D. in Computer Science at the University of Saint Etienne in 2006. He worked as a software engineering engineer for more than 15 years before coming to computer science research. His current main research interests concern text-mining, opinion mining, knowledge discovery from data and decision making

A. @bullet, . Harb, and . Ph, D. student majoring in Computer Science at Ecole des mines of Saint-Etienne. His advisors are Prof Jean-Jacques Girardot and ass. Prof. Kristine Lund. His team is, RIM) of the Genie Industrial and Informatic Centre (G2I). He is working on: A model for the interrogation of traces of activities of collaborative interaction

@. Dr, François Trousset is assistant professor at the engineer school : Ecole des Mines d'Alès France He received a Ph. D. in Computer Science at the University of Besançon. He works as a system ingeneer for more than 15 years before recently comming back to computer science research. His current main research interests concern secure computing while preserving privacy of datas, knowledge discovery from data and decision making