Abstract-PSDL is a language for describing prototypes of real-time software systems. It is most useful for requirements analysis, feasibility studies, and the design of large embedded systems. PSDL has facilities for recording and enforcing timing constraints, and for modeling the control aspects of real-time systems using nonprocedural control constraints, operator abstractions, and data abstractions. The language has been designed for use with an associated prototyping methodology. PSDL prototypes are executable if supported by a software base containing reusable software components in an underlying programming language (e.g., Ada).
LUQIAbsfrucf-This paper presents a graph model of software evolution. We seek to formalize the objects and activities involved in software evolution in sufficient detail to enable automatic assistance for maintaining the consistency and integrity of an evolving software system. This includes automated support for propagating the consequences of a change to a software system.
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