BibSonomy ::  user :: neilernst ::

Requirements evolve, not only during system development but also after a system has been installed. The aim of the work on the EVE EVolution Engineering project is to develop practi-cal methods for dealing with requirements evolution. This pa-per presents the early output from our work-the EVE frame-work for requirements evolution. The EVE framework is com-prised of two components: a meta-model and an associated process model. The EVE meta-model captures a set of model-ling concepts in requirements evolution, including change, impact, risk and viewpoint. The EVE process model provides technologists with a framework for handling the emergence of new or changing requirements during the lifetime of a system. The paper illustrates the EVE framework on a simple example, and highlights the importance of social and environmental re-sponsibility in requirements evolution.

Model Management addresses the problem of managing an evolving collection of models, by capturing the relationships between models and providing well-defined operators to manipulate them. In this paper, we describe two such operators for manipulating hierarchical Statecharts: Match, for finding correspondences between models, and Merge, for combining models with respect to known correspondences between them. Our Match operator is heuristic, making use of both static and behavioural properties of the models to improve the accuracy of matching. Our Merge operator preserves the hierarchical structure of the input models, and handles differences in behaviour through parameterization. In this way, we automatically construct merges that preserve the semantics of Statecharts models. We illustrate and evaluate our work by applying our operators to AT\&T telecommunication features.