Ralf Jungclaus

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TROLL is a language particularly suited for the early stages of information system development, when the universe of discourse must be described. In TROLL the descriptions of the static and dynamic aspects of entities are integrated into object descriptions. Sublanguages for data terms, for first-order and temporal assertions, and for processes, are used to(More)
In this paper, an approach to formally specify a conceptual model of a system and its environment to be developed in a behavior-oriented way is presented. We identify those concepts of object-oriented approaches that have to be formalized. We then propose characteristics of behavior-oriented mathematical models representing a system as a collection of(More)
Conceptual modelling sometimes in conjunction with requirements acquisition is widely accepted as the rst formal step in information system speci cation and design Since knowledge about the world to be modelled is often vague in early development phases formalisms for conceptual modelling must support a wide va riety of concepts for describing real entities(More)