Abstract: This paper aims to develop a framework of objectoriented service design to integrate the structured analysis and design technique, unified modeling language and modular logic to help in designing and analyzing requirements of Teledata Collection System. Based on business principle of DCS, a conceptual modular design framework is built integrating the IDEF0/3 method, use case diagram, class diagram, and activity diagram together. The results show that IDEF, UML and modularity used simultaneously as design principles can ensure service requirements design visibility and semantic meaning accurately at three layers (service, process, activity) in the modular service architecture. The proposed framework is directed to show how, at the strategically level, IDEF0, use case diagram and modular logic can be integrated to systematically translate customer requirements into service functional designs and how, at the operational level, the service developer can transform service functional designs to working procedure with IDEF3, class diagram, activity diagram, and modular logic.

Key words: modular design, object-oriented design, UML, IDEF