The present invention relates to a UDDI server and method in a UDDI server for mediating Web services provided by a number of service providers to a number of service requesters. The UDDI server according to the present invention is adapted to provide support for taking dynamic quality of service into account in the mediation of Web services. The UDDI server comprises a Web service register which includes data sets for storing QoS status information. The QoS status information is information on the current QoS that an associated Web service can offer to a service requester. The QoS status information stored in the data sets is updated periodically based on dynamic service status information received from the service providers. The UDDI server may optionally include a decision making function for selecting a Web service that satisfy a set of QoS requirements of a service requester.
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