Financial support from the following institutions, in addition to the personal contributions of the 200 parti cipants, made the conference an enjoyable event - Universite d' Aix-Narseille III - Centre National de la Recherche Scientifique - City of Aix-en-Provence - Faculte d'Economie Appliquee - G.R.A.S.C.E. Association Fran~aise de Science economique - Air France - Chambre de Commerce et d'Industrie de Marseille - Chambre Regionale de Commerce et d'Industrie (Provence - Alpes - Cote d'Azur - Corse) - Compagnie Fran~aise des Petroles - Conseil General des Bouches-du-Rhone - Conseil Regional (Provence - Alpes - Cote d'Azur) - Electricite de France - Societe Lyonnaise de Banque - Societe Nationale des Chemins de Fer Fran~ais - Union des Assurances de Paris. Both before and during the conference, Hs. Daniele Durieu, Martine Harciano, Magali Orillard and Catherine pivot managed to avoid an always imminent chaos. P. Batteau, C. Jameux, J.L. Le Hoigne and J. de Montgolfier helped intensively in the organizing committee. The preparation of the manuscript owes much to Daniele Durieu and Isabelle ~1ichelot. J .A. Bartoli was most helpful in com~uterizing the preparation of the general index. He also benefited in this last respect of the help of our students I. Bouchet, R. Bout, P. de Cibeins, S. Delaye, C. Mallie, C. Martin, J-F. Morhain, J-C. Picton, N. Vock, all at the Faculte d'Economie Appliquee in Aix-en-Provence.

Inhalt
Overview.- Introductory Chapter.- Problems in Behavior under Risk : Individual vs. Group Decision Making.- I / Multicriteria Decision Making and Social Choice.- Risky Buying of Huge Quantities Under Time Pressure and Partial Information.- Main Sources of Inaccurate Determination, Uncertainty and Imprecision in Decision Models.- Inferential Modes in Applying Social Choice Theory.- The True Rule of The Marquis de Condorcet.- II / Game Theory, Cooperation and Negotiation.- Negotiation Procedure in a Coherent Game.- Fairness and Efficiency in the Siting of Public Service Facilities : A Negotiatory Approach.- A Fair Division Process in a Cooperative N-Person Context Where Side-Payments Are Allowed.- Evolutionarily Stable Strategies in the Prisoner's Dilemma and Chicken Games.- Cooperation in Finitely Repeated Non-Cooperative Games.- III / Heurictic Systems for Negotiation and Group Decision.- A Redescription of a Negotiation Problem With Decision-Makers Under Pressure.- Generating and Editing Compromise Proposals for Negotiations.- Repeated Negotiation Sessions : A Generalized Gametheoretic Approach.- Conflict Analysis as a Negotiation Support System.- Can a Computer Aid Group Decision Making?.- A Multidimensional Model by a Multiactor System.- Subject and Name Index.