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Abstract
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Multimedia communication has become a service that is used more and more frequently. Users now expect to receive a certain end-to-end Quality of Service (QoS) at their terminals. Therefore, the terminal has to implement a Quality of Service control mechanism that tries to optimize the parameter setting. In order to achieve this, the {\em experienced QoS} at the user is measured and then compared to the {\em expected QoS} for the specific type of application. If the experienced and the expected QoS differ, the application has to adjust its parameters. To do this, quantitative knowledge of the influence of certain parameter settings is necessary. At the University of Stuttgart, an {\tt eXperimentation Platform} ({\tt XP}) is being developed that allows the investigation of the influence of parameters in the terminals as well as the influence of and on the network infrastructure for multimedia communication applications.
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