The Second International Conference on Foundations of Utility and Risk Theory was held in Venice, June 1984. This volume presents some of the papers delivered at FUR-84. (The First International Conference, FUR-82, was held in Oslo and some of the papers presented on that occasion were published by Reidel in the volume Foundations of Utility and Risk Theory with Applications, edited by Bernt P. Stigum and Fred Wenst~p). The theory of choice under uncertainty involves a vast range of controversial issues in many fields like economics, philosophy, psychology, mathematics and statistics. The idea of discussing these problems in international conferences has been successful: two conferences have been held and others will follow. The climate of the debate has changed in the meantime, partly as a result of these conferences. It is no more only a question of attacking or defending the neo-Bernoullian assumptions, but also of proposing wider generalizations and including new elements in the analysis of the decision process. For instance Amartya Sen - comparing the two current notions of rationality, internal consistency and self-interest pursuit introduces the concept of reasoning and considers the irrationality which may result from the failure of a positive correspondence between reasoning and choice or from a limited capacity of reasoning. Rationality is also considered with respect to the controversial axiom of strong independence. John C. Harsanyi introduces the concept of practical certainty, i. e.

I. Rationality and Uncertainty in Decision Theory.- Rationality and Uncertainty.- Practical Certainty and the Acceptance of Empirical Statements.- A New Basis for Decision Theory.- Some Questions about Bayesian Decision Theory.- Regret, Recrimination and Rationality.- II. Utility and Uncertainty.- Determination of Cardinal Utility According to an Intrinsic Invariant Model.- The Present State of Utility Theory.- A Characterization of Decision Matrices that Yield Instrumental Expected Utility.- Associative Means and Utility Theory.- On Utility Functions in a Financial Context.- The Generalized Means Model (GMM) for Non-Deterministic Decision Making.- Individual Cardinal Utility, Interpersonal Comparisons, and Social Choice.- Surviving Implications of Expected Utility Theory.- Consistency and Expected Utility Theory.- Aggregate Revealed Preferences and Random Utility Theory.- Concave Additively Decomposable Representing Functions and Risk Aversion.- III. Information and Utility.- Concepts of Information Based on Utility.- Information Utility - Statistical and Semantical Features.- IV. Risk Propensity and Decision.- Assessing Risk Propensity.- What Naive Decision Makers can Tell Us About Risk.- A Measure of Risk Aversion in Terms of Preferences.- State-Dependent Utility and Risk Aversion.- V. Decision Making Under Uncertainty.- The Impact of Uncertainty on the Optimal Decision of Risk Neutral Firms.- Strategic Planning Models and Risk Management.