Part 1 : Introduction. Introduction to decision making under uncertainty : biases, fallacies and the development of decision making -- Part 2 : Cognitive decision research. The theoretical status of judgmental heuristics / Thomas S. Wallsten ; The base rate fallacy controversy / Maya Bar-Hillel ; The two camps on rationality / Helmut Jungermann ; The role of heuristics in models of decision / Rudolf Groner, Marina Groner and Walter F. Bischof ; On the testability of the availability heuristic / Klaus Fiedler ; Problem structuring calculi and levels of knowledge representation in decision making / Patrick Humphreys and Dina Berkeley ; Verbal vs. numerical processing of subjective probabilities / Alf C. Zimmer ; Subjective expected utility : a model of decision making / Baruch Fischoff, Bernard Goitein and Zur Shapira -- Part 3 : Social interaction. Conditions of violating individual rationality / Werner H. Tack ; Biases in group decision making / Helmut W. Crott and Johannes A. Zuber ; The dependance of cognition and behavior in 2 x 2 matrice games / Ulrich Schulz and Theo May ; On the prominence structure of the decimal system / Wulf Albers and Gisela Albers -- Part 4 : Development and epistemology. Conceptual and theoretical issues in developmental research on the acquisition of the probability concept / Roland W. Scholz and Manfred Waller ; The perception of probability situations in pupils aged 12 to 14 / Georges Glaeser ; The psychology of inference and the teaching of probability and statistics : two sides of the same coin? / J. Michael Shaugnessy ; (Mis- ) Interpretation of stochastic models / George Schrage ; Randomness and stochastic independence-- on the relationship between intuitive notion and mathematical definition / Gerd v. Harten and Heinz Steinbring ; Decision-theoretic paradoxes / Georg Pflug -- Part 5 : Comments. The possible and the profitable : some remarks on the symposium's impact on decision research / Baruch Fischoff ; The importance of the fictional for theories of knowledge : some remarks on the symposium's impact on cognitive psychology / Alf C. Zimmer ; Why are developmental psychologists biased with regard to the biasedness of the human subject? : some remarks on the symposium's impact on developmental psychology / Manfred Waller ; Individual decision making and social psychology : some remarks on the symposium's impact onsocial psychology / Katrin Borcherding ; Towards a theory of limited rationality : some remarks on the symposium's impact on economic theory / Reinhard Selten ; Towards an education for decision behavior : some remarks on the symposium's impact on mathematical education / Hans-georg Steiner.