June 2000/Vol. 43, No. 6 COMMUNICATIONS OF THE ACM Wilhelm Hasselbring INTEGRATION F JAMES GARY INFORMATION SYSTEM or information systems, it is increasingly difficult to draw a line around an application system and say that you own and control it. For example, as value chains extend beyond enterprises, supplier and customer systems become part of each other s information architectures. Furthermore, in many application areas, data is distributed over a multitude of heterogeneous, often autonomous information systems, and an exchange of data among them is not easy. Figure 1 illustrates such a vertical fragmentation of organizational units. Each unit may be structured within three architectural layers, as described in the following. The business architecture layer defines the organizational structure and the workflows for business rules and processes. It is a conceptual level expressed in terms meaningful to actual users of application systems. The application architecture layer defines the actual implementation of the business concepts in terms of enterprise applications. At this layer, it is the central goal to provide the glue between the application domain described in the business architecture and the technical solutions described in the technology architecture. Research in information systems aims at filling the
Communications of the ACM – Association for Computing Machinery
Published: Jun 1, 2000
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