The success of a Decision Support System (DSS) can be influenced by many complex and intertwined factors which are often not clearly understood. This research investigates one such factor, that of the tools and techniques used by system analysts to assist them in the development of a successful DSS. By using a combination of quantitative and qualitative techniques it was firstly determined what tools and techniques were used by system analysts during DSS analysis activities, and second it was determined how and why system analysts used these tools and techniques. The outcome of this research is a series of findings that would assist not only a novice, but also a more experienced, systems analyst to more effectively determine the user requirements during DSS analysis activities.