An investigation: reengineering sequential procedure-driven software into object-oriented event-driven software through UML diagrams

Reengineering a COBOL legacy system is a difficult multi-step process, particularly when the COBOL legacy system is a sequential procedural-driven system which is being reengineered into an object oriented, event-driven system. In this scenario, it is necessary to analyse the legacy system in order to identify possible objects with their attributes and methods within the code and to determine how the legacy system's variables and procedures interrelate in order to model pseudo-events from strictly sequential code. The focus of reengineering is too often based on theory rather than based on experience gained from real-world examples. This paper hopes to address this imbalance by providing a practical application of reengineering to an actual legacy telecommunications system.