Many information systems have failed to achieve their promised potential because of the inability of the analyst to design a system that was attuned to the needs of the decision maker. To remedy this situation, it is essential to develop tools that facilitate the process of defining distinct decision parameters, understandable by the decision maker, the analyst, and others in the organization. The primary purpose of this paper is to present, develop, and test a methodology for eliciting the information used, or desired to be used, by decision makers in choice-set environments. Additionally, guidelines are suggested for incorporating the methodology into the design of an information system.