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In the place of mass production which no longer seems suitable for today's market, the mass customization trend provides companies with new possibilities for creating loyalty bonds. Structural changes and increasing demand for products and their associated services are expected to raise an exponential growth of pervasive service ecosystems in the next few years. This leads to instant collaborative organizations which involve both final consumers and business partners. As a consequence, information systems need to be interoperable. Unfortunately, existing enterprise engineering approaches and information systems technologies lack the intrinsic agility and adaptability features required by these service-based collaborative organizations. To solve this problem, we consider services as dynamic objects generated according to a particular context. We further introduce a multi-level service model by which multilevel class diagrams describe various facets of a particular service in terms of security and data interchange.