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QoS-Aware Web Service Selection Accounting for Uncertain Constraints

The paper proposes a new approach for web service selection that takes into account the uncertainties existing both in the web services' behavior with respect of their Quality of Service (QoS) properties and the clients' non-functional requirements. The probability theory and the theory of fuzzy sets are used as a theoretical base for formalization of these uncertainties. The feasibility of the approach is proved through a real scenario for web service selection.