Information System Conversion in SMEs

Abstract

Information system conversion has been with us since users of punched-card tabulating systems first moved to vacuum-tube computers. However, it is often seen as an after thought: once the “interesting” work of analysis, design and so on is done, it will some how happen. This chapter attempts to view the process holistically, from both the tech nical and human viewpoints, reflecting the fact that information systems have both tech nical and human components. It shows how ignoring one side or the other can lead to problems, which can be avoided if all aspects are considered together. It proposes a sys tematic approach to considering these issues and points out benefits of using it.

An Agile Approach for Converting Enterprise Architectures

“…There are four main conversion methodologies that the companies resort to realize fundamental system changes [3] [4]. They are named as direct cut-over conversion (known as the big bang conversion), parallel conversion, phased conversion and pilot conversion.…”

“…Nevertheless, big bang conversion is treated as the riskiest method in the literature [4] [6]. First of all, 'fall back'-plans are hard to develop and become more impossible when the big bang has taken place.…”

“…With coexistence methodology in data level, two systems can be run simultaneously for some period of time. When the requirements for the new system are met, the old system is shut down [4]. Although the process requires careful planning and control as well as a significant investment in labor hours, it is favored as it minimizes risk compared to the other conversion methodologies.…”