Barbara Paech

Manfred Broy, Franz Huber, Barbara Paech et al.

Modeling and documentation are two essential ingredients for the engineering discipline of software development. During the last twenty years a wide variety of description and modeling techniques as well as document formats has been proposed. However, often these are not integrated into a coherent methodology with well-defined dependencies between the models and documentations. This hampers focused software development as well as the provision of powerful tool-support. In this paper we present the main issues and outline solutions in the direction of a unified, formal basis for software and system modeling.

Barbara Paech, Bernhard Rumpe

This paper aims at integrating heterogeneous documents used in pragmatic software develpoment methods to describe views with a formal refinement based software development process. Therefore we propose an integrated semantics of heterogeneous documents based on a common system model and a set of syntactic development steps with a well-defined semantics for document evolution. The use of the development steps is demonstrated in a small example.

Ruth Breu, Ursula Hinkel, Christoph Hofmann et al.

The Unified Modeling Language UML is a language for specifying visualizing and documenting object oriented systems UML combines the concepts of OOA OODOMT and OOSE and is intended as a standard in the domain of object oriented analysis and design Due to the missing formal mathematical foundation of UML the syntax and the semantics of a number of UML constructs are not precisely defined.This paper outlines a proposal for the formal foundation of UML that is based on a mathematical system model

Barbara Paech, Bernhard Rumpe

In this paper we propose I/O state transition diagrams for service description In contrast to other techniques like for example Statecharts we allow to model non atomic services by sequences of transitions This is especially important in a distributed system where concurrent service invocation cannot be prohibited We give a mathematical model of object behaviour based on concurrent and sequential messages Then we give a precise semantics of the service descriptions in terms of the mathematical model.