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Developers of QoS (quality of service) applications need component frameworks that support QoS to improve their development process. We propose to use the component infrastructure level for the integration of QoS facilities to avoid the problems of QoS infrastructures dependencies, and to simplify the development process of applications. This paper introduces our model of QoS-aware component, and describes its relevant entities. In our support of the model, the component descriptor provides facilities for the configuration of QoS attributes, and the component container isolates the QoS business component from the basic QoS infrastructures, which are supported in QoS-aware networks, OS and middleware. In this paper we include some practical results based on QoS-aware components that include support to guarantee the response times, jitter and resource consumption based on resource reservation services.