TROLL - A LANGUAGE FOR OBJECT-ORIENTED SPECIFICATION OF INFORMATION-SYSTEMS

TROLL is a language particularly suited for the early stages of inform ation system development, when the universe of discourse must be descr ibed. In TROLL the descriptions of the static and dynamic aspects of e ntities are integrated into object descriptions. Sublanguages for data terms, for first-order and temporal assertions, and for processes, ar e used to describe respectively the static properties, the behavior, a nd the evolution over time of objects. TROLL organizes system design t hrough object-orientation and the support of abstractions such as clas sification, specialization, roles, and aggregation. Language features for state interactions and dependencies among components support the c omposition of the system from smaller modules, as does the facility of defining interfaces on top of object descriptions.