Negotiation support is an important challenge for business-to-business e-commerce that is still poorly supported in current information systems. One reason is that negotiation processes are much harder to formalize than the business processes in the fulfilment phase. The goal of this paper is to provide the basis for a formal analysis of different types of electronic negotiations which can help...

Among the many ways to view oriented matroids as geometrical objects, we consider two that have special properties: • Bland’s analysis of complementary subspaces in IRn [2] has the special feature that it simultaneously and symmetrically represents a realizable oriented matroid and its dual; • Lawrence’s topological representation of oriented matroids by arrangements of pseudospheres [4] has th...

1 I n t r o d u c t i o n With the success of object-orientation in complex application domains, an interest in reverse engineering of legacy relational databases into object-oriented specifications has been risen. Such a specification can be seen as defining a view of the relational database in terms of an object-oriented data model. The derivation of such a view has received considerable at t...

The separation of concerns, as a conceptual tool, enables us to manage the complexity of the software systems that we develop. There have been a number of approaches aimed at modularizing software around the natural boundaries of the various concerns, including subject-oriented programming [Harrison & Ossher, 93], composition filters [Aksit & Bergmans, 1992], aspect-oriented programming [Kiczal...

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