The purpose of this project was to research, collect, and evaluate all available information on Decision Support Systems (DSS) Theory. DSS are interactive, conversational computer systems supporting decision makers. DSS rely heavily on human intuition, judgement, and experience as an integral part of the decision process. DSS designers emphasize the interfacing mechanisms between the decision maker and the computer. Terms characterizing DSS include: computer-based, interactive, conversational, flexible, adaptable, convenient, quick, helpful, and reliable. Color graphics terminals, light pens, joy sticks, digitizer pads, and similar devices usually replace or augment the typewriter terminal in the design of DSS to enhance the man-machine interface. DSS design draws on three important methodologies: operations research and management science (OR/MS), computer science, and behavioral science. DSS utilizes the modelling and analysis techniques of OR/MS to identify and evaluate alternative courses of action. Computer science contributes the necessary expertise in information storage, processing, and retrieval. Finally, DSS design accounts for those elements of individual and group behavior to ensure the best utilization of the decision maker in the interactive decision making process and acceptance by the decision maker and the organization of the DSS.