Modeling Decisions for Artificial Intelligence : First International Conference MDAI 2004 Barcelona Spain August 2 4 2004. Proceedings This book constitutes the refereed proceedings of the First International Conference on Modeling Decisions for Artificial Intelligence MDAI 2004 held in Barcelona Spain in August 2004. The 26 revised full papers presented together with 4 invited papers were carefully reviewed and selected from 53 submissions. The papers are devoted to topics like models for information fusion aggregation operators model selection fuzzy integrals fuzzy sets fuzzy multisets neural learning rule based classification systems fuzzy association rules algorithmic learning diagnosis text categorization unsupervised aggregation the Choquet integral group decision making preference relations vague knowledge processing etc