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Systems based on the service-oriented architecture (SOA) principles have become an important cornerstone of the development of enterprise-scale software applications. They are characterized by separating functions into distinct software units, called services, which can be published, requested and dynamically combined in the production of business(More)
We present a framework for the simulation and formal analysis of workflow models. We discuss (i) how a workflow model, implemented in the BPEL language, can be transformed into a dataflow network model, (ii) how potentially incorrect execution paths can be incorporated, and (iii) how the properties of a workflow can be formally verified using the SPIN model(More)
Redundant sensing capabilities are often required in sensor network applications due to various reasons, e.g. robustness, fault tolerance, or increased accuracy. At the same time high sensor redundancy offers the possibility of increasing network lifetime by scheduling sleep intervals for some sensors and still providing continuous service with help of the(More)
As Web service-based system integration recently became the mainstream approach to create composite services, the dependability of such systems becomes more and more crucial. Therefore, extensions of the common service composition techniques are urgently needed in order to cover dependability aspects and a core concept for the dependability estimation of(More)
Electronically executed business processes are frequently implemented using the Business Process Execution Language (BPEL). These workflows may be in control of crucial business processes of an organization, in the same time existing model checking approaches are still immature i.e. they either seem to loose to much information during the generation of the(More)
Nowadays, due to the rapid increase in the number of available web services, more and more emphasis is put on their reliability, availability, security, etc. In order to meet such non-functional requirements, a service needs to be designed for reliability by making design decisions on a high, architectural level. Fortunately, web service related standards(More)
Due to the increasing need of highly dependable services in Service-Oriented Architectures (SOA), service-level agreements include more and more frequently such non-functional aspects as security, safety, availability, reliability, etc. Whenever a service can no longer be provided with the required QoS, the service requester needs to switch dynamically to a(More)
The IST-FET Integrated Project SENSORIA is developing a novel comprehensive approach to the engineering of service-oriented software systems where foundational theories, techniques and methods are fully integrated into pragmatic software engineering processes. The techniques and tools of SENSORIA encompass the whole software development cycle, from business(More)