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Web service technology promises advances in the dynamic integration of on-line services. Mechanisms are needed to assist in verifying the quality of these services. The end user of a Web service will quickly detect if the content is handled correctly and if the business process rules are adhered to, but often, many unwarranted assumptions are made concerning the quality of a service. Is the provider of the service reliable? If not, the consequences will primarily impact the user, who will blame the provider for delivering bad services. This paper explains the need for Web service credentials to address this issue and explores several aspects of an approach that facilitates a trustworthy dynamic integration of services.
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