Symbolic and Quantitative Approaches to Reasoning with Uncertainty : 6th European Conference ECSQARU 2001 Toulouse France September 19–21 2001 Proceedings This book constitutes the refereed proceedings of the 6th European Conference on Symbolic and Quantitative Approaches to Reasoning with Uncertainty ECSQARU 2001 held in Toulouse France in September 2001. The 68 revised full papers presented together with three invited papers were carefully reviewed and selected from over a hundred submissions. The book offers topical sections on decision theory partially observable Markov decision processes decision making coherent probabilities Bayesian networks learning causal networks graphical representation of uncertainty imprecise probabilities belief functions fuzzy sets and rough sets possibility theory merging belief revision and preferences inconsistency handling default logic logic programming etc