The world we live in today demands systems that make our lives easier and help us make the right choices on time. There exists a growing need for quality products that help us in our day to day activities. Easy-to-use computer-based decision support systems apply all available and applicable data with the correct model, knowledge and skill of decision makers to support the user to choose the best solution. It is therefore important to develop decision support systems correctly to be of value to the user. Looking at other information system developments, the author tries to suggest ways to develop decision support systems. System development methodologies are investigated to determine if they are able to address the development of the very important decision support system components. Five methodologies were discussed and researched for their theoretical suitability to address the development of decision support systems. The author performed qualitative research using case studies and semi-structured interviews to assess the use or non-use of system development methodologies in the development of decision support systems in a South African context. Content and cross-case analyses were used to achieve results that are discussed to broaden the knowledge on the development of decision support systems. The author provides some explanations to why system development methodologies were not used in the development of the case studies. This research not only contributes to the academic body of knowledge about using system development methodologies in the development of decision support systems, but could also be useful to developers embarking on a new decision support system development. / Thesis (MSc (Computer Science))--North-West University, Potchefstroom Campus, 2011.

The world we live in today demands systems that make our lives easier and help us make the right choices on time. There exists a growing need for quality products that help us in our day to day activities. Easy-to-use computer-based decision support systems apply all available and applicable data with the correct model, knowledge and skill of decision makers to support the user to choose the best solution. It is therefore important to develop decision support systems correctly to be of value to the user. Looking at other information system developments, the author tries to suggest ways to develop decision support systems. System development methodologies are investigated to determine if they are able to address the development of the very important decision support system components. Five methodologies were discussed and researched for their theoretical suitability to address the development of decision support systems. The author performed qualitative research using case studies and semi-structured interviews to assess the use or non-use of system development methodologies in the development of decision support systems in a South African context. Content and cross-case analyses were used to achieve results that are discussed to broaden the knowledge on the development of decision support systems. The author provides some explanations to why system development methodologies were not used in the development of the case studies. This research not only contributes to the academic body of knowledge about using system development methodologies in the development of decision support systems, but could also be useful to developers embarking on a new decision support system development. / Thesis (MSc (Computer Science))--North-West University, Potchefstroom Campus, 2011.