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#external-behavior
Towards An Ontology Of Software: A Requirements Engineering Perspective
Software systems versus software products
While the essential function of a software system is to control the external behavior of a certain machine (i.e., according to the Jackson et al.’s approach, that part of the behavior that is “visible” to both the environment and machine), the essential function of a software…
Environment and machine in requirements engineering
several papers by Jackson and Zave [9], [21], [10], which draw a clear distinction between the environment, which is where the ultimate effects of software are expected, and the machine, the computer-driven system where software operates. Their goal is to show that the…