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Abstract-Inter-organizational systems have significantly been affected by Service-oriented Architectures (SOA) and Web Services -the state-of-the-art technology to implement SOA. SOA is said to enable quick and inexpensive changes of the IT in order to establish new business partnerships or to reflect changes in existing partnerships. However, current approaches to inter-organizational systems focus too much on existing Web Services standards and, thus, on the technology layer. In such an approach the technology drives the business. In this paper we analyze the shortcomings of this bottom-up approach. As an alternative we suggest a top-down methodology where the business requirements drive the technology. This methodology starts off with the business value perspective, leading to a business process perspective and resulting in an IT execution perspective. We do not invent any new approaches on each of these layers, rather we outline how existing approaches are used and combined into a business requirements driven approach to inter-organizational systems.

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In order to open-up enterprise applications to e-business and make them profitable for a communication with other enterprise applications, a business model is needed showing the business essentials of the e-commerce business case to be developed. Currently there are two major business modeling techniques -e3-value and REA (Resource-EventAgent). Whereas e3-value was designed for modeling value exchanges within an e-business network of multiple business partners, the REA ontology assumes that, in the presence of money and available prices, all multi-party collaborations may be decomposed into a set of corresponding binary collaborations. This paper is a preliminary attempt to view e3-value and REA used side-by-side to see where they can complement each other in coordinated use in the context of multiple-partner collaboration. A real life scenario from the print media domain has been taken to proof our approach.