A decision support system (DSS) is a computer system that encompasses mathematical models, informational databases and a user interface to help managers make better decisions. This course is intended to develop an appreciation of the nature of managerial business decision making as well as a working knowledge of Decision Support Systems (DSS) for facilitating the process of semi-structured decision making. Issues associated with the development of these systems are introduced, along with some of the underlying mathematical modelling techniques that provide DSS with a problem solving capability.