Integration Issues in Information System Reengineering - Computer Software and Applications Conference, 1996. COMPSAC '96., Proceedings of 20th Internation

In this paper we address the problem of how to apply the schema integration techniques in the legacy system migration since some issues in the legacy concept: legacy system migration and reengineering are closely related to the schema integration methods. The importance of introducing integration issues to legacy system migration lies in the following aspects: 1) To adapt the legacy systems to a modem environment requires the integration (harmonization) of requirements for both legacy and moderns systems. 2 ) Because a legacy information system is very large, it has to be decomposed into a number of smaller, relatively independent units in order to be easier to migrate to the target system. These decomposed units should be integrated into a whole again after the migration process. This situation becomes more complex and difficult when the legacy system was designed and modified using several requirements and data modelling methods. In this paper, we attempt to pose the initial integration problems regarding these aspects: requirement and function schema integration, and database schema integration. K e y w o r d s : schema integration, legacy system migration, information system reengineering