In 1998 CEFACT decided to use modeling in the development process of EDI standards. On the basis of a careful analysis of various modeling techniques the Techniques and Methodologies Working Group (TMWG) decided that the Unified Modeling Language (UML) is be best suited for this purpose. The concepts of UML are appropriate to introduce modeling into the current UN/EDIFACT standard development process and also into a future process that may take advantage of new technology such as Object Oriented EDI (OO-edi). UML is called a modeling language, which uses a mainly graphical notation to express designs. It is not a method. Therefore, a process is needed to advice which steps to take in doing a design. In this paper we present a case study on modeling inter-organizational trade procedures based on an UML methodology. The design process utilizes the following UML notations: use case diagrams, class diagrams, activity diagrams and sequence diagrams. The methodology is introduced by means of the international trade transaction model.
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