Contents - Probability, possibility, belief: which and where? - Multi-valued logics - Fuzzy logic - The Bayesian approach - Confirmation theory - Possibility theory : qualitative and quantitative aspects - Families of probabilities - The evidentiary value model - The transferable belief model for quantified belief representation - Infinitesimal theorie of uncertainty for plausible reasoning - Statistical inference - Graphical models for probabilistic and causal reasoning - Game theory - Psychological challanges for normative models