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The Web and Grid services frameworks provide a promising infrastructure for cross-organizational use of online services. The use of services in large-scale and cross-organizational environments requires the negotiation of agreements that define these services. Buying at a fine granularity just when a need arises is only feasible if the costs of establishing(More)
Service Level Agreements (SLAs) are a vital instrument in service-oriented architectures to reserve service capacity at a defined service quality level. Provisioning systems enable service managers to automatically configure resources such as servers, storage, and routers based on a configuration specification. Hence, agreement provisioning is a vital step(More)
In today's Internet economy, new business models emerge to respond to business opportunities that one organization alone can not exploit. Virtual organizations (VOs) are a prominent example for such models currently investigated in, e.g., collaborative engineering and aggregated services provisioning. The partner selection process is a problem that needs to(More)
Individualized services are common in distributed computing systems: Consumers demand custom solutions and service providers tailor their offering. In negotiating a service contract, providers and consumers frequently fail in identifying the optimal combination of non-functional properties and price. A key reason is that negotiators simultaneously try to(More)
A new generation of patient-driven healthcare information systems (HIS) is emerging to advance traditional healthcare services and empower patient self-responsibility. Professional approaches to develop or improve HIS exist alongside evolving individual and community-shared approaches where patients take responsibility for their health data and health.(More)