Abstract
Decision support systems provide leading decision makers with computer support in their planning, problem solving, and decision making. These systems are constructed to deal with complex and ill-structured problems, and to provide means and methods for interactive, computer supported problem solving. It is argued that the conceptual framework developed for fuzzy multiple criteria decision making (MCDM) is useful for dealing with ill-structured problems. Approximate reasoning is shown to be useful as a basis for problem-solving algorithms in a decision support system.