Concepts and methods that define decision-making processes, as well as tools for justifying and supporting them, are considered. Axiomatic theories of rational behavior, multi-criteria decisions under objective models, methods for evaluating and comparing multi-criteria alternatives, features of human information processing in connection with decision-making are covered. Modern approaches to building expert databases, analyzing and making decisions, the activities of advisory firms and consultants on decision-making problems are disclosed. Unlike the first edition (M.: Logos, 2000), the book contains chapters on decision-making in organizations and risk analysis. Methods of analytical hierarchy of comparative superiority of alternatives on indices of agreement and disagreement and multi-criteria theory of utility are described.