Flexible provisioning of web service workflows
ACM Transactions on Internet Technology (TOIT)
Interactive selection of Web services under multiple objectives
Information Technology and Management
Evaluating quality of web services: a risk-driven approach
BIS'07 Proceedings of the 10th international conference on Business information systems
Service Oriented Computing and Applications
Towards robust service compositions in the context of functionally diverse services
Proceedings of the 21st international conference on World Wide Web
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A composition arranges available services resulting in a defined flow of tasks. A discovery process identifies the suitable candidate services for a composition. A subsequent selection process chooses the optimal candidate for each task. The selection process can consider — if supported — different quality-of-service (QoS) categories of the individual services to optimise the quality of the whole composition. The result is a quality-optimised assignment of candidates to each task. This paper discusses how already identified candidates, which a selection process originally has separated out, can improve a composition w.r.t. particular QoS categories. To realise this improvement, redundant arrangements involve the alternative candidates in order to supplement the originally assigned service. We formed these redundant arrangements on the basis of our previously introduced compositions patterns. The contribution of this paper is a model which allows to aggregate the resulting QoS of the composition when these arrangements are applied.