Are Use Cases Necessarily the Best Start of an OO System Development Process?
Object-oriented modeling techniques may be used for modeling an automated information system, as well as for modeling the environment (the organization) using that system (D’Souza and Wills, 1999). You may even integrate the model of the system with the model of the environment. Where (and how) do you, however, draw the boundary between the environment and the computerised system? In a majority of the published models, the boundary is drawn through the message-symbols depicting the communication between objects in the environment and objects within the computerised system, implying that the interface of the system is identical with the aggregation of the interfaces of all the interface objects. This way of thinking is reinforced by the actor stereotype of UML (see for example (Eriksson and Penker, 1998) or (Jacobson, Booch, and Rumbaugh, 1999)), which implies the notion that some objects are definitely outside the systems, others inside. The paradigm has been inherited from the good old Dataflow context diagrams of the Structured Analysis and Design Methods (deMarco, 1978; Constantine and Yourdon, 1979) where a sole process in the middle serves the interests of the external entities connected by dataflows to that process.
KeywordsPower Consumption Computerise System Power Company Case Diagram Collaboration Model
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