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Decreasing Service Coupling to Increase Enterprise Agility
Abstract
The agility with which an Enterprise Information Systems (EIS) can be changed is of primordial importance in today's fast paced, competitive market. This depends on the changeability of the EIS software resources, which in turn is heavily influenced by the coupling between the services implemented by these resources. This chapter presents a solution to the coupling problem based on the concepts of structural compliance and conformance, in which compatibility between interacting services does not rely on a shared schema. Instead, it checks resources component by component, recursively, until primitive elements are reached. However, coupling is not a single-faceted issue and involves several aspects and slants. To help in understanding and systematizing them, the chapter proposes a multidimensional framework that caters for EIS lifecycle stages, concreteness (with various levels of abstraction), interoperability (based on structural compliance and conformance), and concerns (to deal with non-functional aspects such as security, reliability and quality of service).
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