1 Introduction -- The Logic of Decisions, Behavioral Decision Theory, and Decision Technology -- Optimization, Outranking, Evaluation -- Basics of Fuzzy Set Theory -- 2 Individual Decision Making in Fuzzy Environments -- Symmetrical Models -- Nonsymmetrical Models -- Fuzzy Utilities -- 3 Multi-Person Decision Making in Fuzzy Environments -- Basic Models -- Fuzzy Games -- Fuzzy Team Theory -- Fuzzy Group Decision Making -- 4 Fuzzy Mathematical Programming -- Fuzzy Linear and Nonlinear Programming -- Fuzzy Multi-Stage Programming -- 5 Multi-Criteria Decision Making in Ill-Structured Situations -- Fuzzy Multi-Criteria Programming -- Multi-Attribute Decision Making (MADM) -- Fuzzy Outranking -- 6 Operators and Membership Functions in Decision Models -- Axiomatic, Pragmatic, and Empirical Justification -- The Measurement of Membership Functions -- Selecting Appropriate Operators in Decision Models -- 7 Decision Support Systems -- Knowledge-Based vs. Data-Based Systems -- Linguistic Variables, Fuzzy Logic, Approximate Reasoning -- An Interactive Decision Support System for Fuzzy and Semi-fuzzy Multi-Objective Problems -- Expert Systems and Fuzzy Sets.