These Proceedings report the scientific results of the Summer Study on Plural Rationality and Interactive Decision Processes orga­ nized jointly by the System and Decision Sciences Program of the Inter­ national Institute for Applied Systems Analysis (located in Laxenburg, Austria) and the Hungarian Committee for Applied Systems Analysis.

The approach to plural rationality through soft systems methodology.- Beyond the politics of interest.- The plural rationality and interest of national planners: experiences in Hungary.- Beyond rationality.- The culture of decision making.- Different dissolutions of the man-and-world problem.- Rationality and equivalent redescriptions.- Back from prospect theory to utility theory.- Negotiation and mediation in conflicts. II. Plural rationality and interactive decision processes.- On the structure, stabilization and accuracy of the decision process.- Uses of experimental games.- Plausible outcomes for games in strategic form.- Game and bargaining solutions for group decision problems.- Interactive group decision making by coalitions.- On the role of dynamics and information in international negotiations: the case of fishery management.- Macromodels and multiobjective decision making.- On the components in interactive multiobjective programming methods.- An integrated programming package for multiple-criteria decision analysis.- A trajectory-oriented extension of DIDASS and its applications.- Decision support based on the skeleton method — the HG package.- A principle for solving qualitative multiple-criteria problems.- A decision support system for planning and controlling agricultural production with a decentralized management structure.- On the determination of the optimal temperature for the growth of an early cucumber crop in a greenhouse.- DISCRET — a package for multicriteria optimization and decision problems with discrete alternatives.- Application of DIDASS methodology to a flood control problem — numerical Experiments.- An experimental session with the HG package.- An interactive method for decision support in a two-person game with an example fromregional planning.- Two empirical tests with approaches to multiple-criteria decision making.- Index of keywords.

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