The success of the emerging service oriented computing relies fully on the Quality of Service (QoS). However, existing QoS techniques do not accommodate users' skills and preferences. We propose user-centered QoS, which is a QoS defined by the interaction between skills/preferences of service user(s) and quality of service provider(s). By implementing usercentered QoS approach, the best service is delivered to users based on the calculation not only the quality of the services but also the skill/information of users. We proposed a novel twostage approach for combining services in user-centered QoS, i.e. intra-workflow and inter-workflow service selection. Intraworkflow service selection is used to calculate the most optimal QoS value for each composite service. Inter-workflow service selection is used to search for the most optimal combination of composite services by utilizing the QoS values obtained from intra-workflow service selection. In this paper, we provide a concrete example of user-centered QoS in the language services domain. This problem arises when there are multi users with different quality of English using multilingual chat service.
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