A business process itself is artificial, and is a discrete-event system. This paper uses the business transaction system, which is a multicomponent DEVS proposed by Sato and Praehofer, as a device to design business proc-esses in which web-service like software components are part of the processes.
The static model of business transaction system, called activity interaction diagram (AID, for short), plays a fundamental role in developing a unified framework for universal modeling language (UML), architecture of integrated information systems (ARIS) and event-driven process chain (EPC), and data flow diagram (DFD). The framework provides us with both the meaning of those tools and possibility of automatic transformation of the models described by any of them. Furthermore, it is a guideline for a modeling method to have a validated business process.