On the re-engineering of transaction systems

Abstract

This paper provides a framework for considering the problems of re-engineering transaction processing systems. Such systems are key components of most modern business operations, and their continued enhancement is crucial for competitiveness. The paper grew out of a study of software re-engineering problems and practices carried out by Andersen Consulting at several major companies in the telecommunications industry. It describes some of the practical difficulties found in re-engineering transaction systems, especially the problems caused by the need for an incremental approach and the difficulties of re-engineering in parallel with the continuing evolution of the operational system. This paper presents a model of the maintenance and re-engineering processes showing the main activities that are needed and the data flows among them. Existing tools for re-engineering are then analysed against this model to identify gaps and potential for further tool development. Finally, there is a brief discussion of the very stringent personnel needs of software re-engineering projects.