In this paper, we focus on a Bluetooth piconet, analyzing its ability to support the Quality of Service (QoS) requirements dejned by QoS sensitive applications. We consider two QoS parameters : ( i ) an application constraint denoting the importance degree of a message, and (ii) an endto- end delivery deadline. The QoS perceived by the application depends on the scheduling algorithms chosen at the medium access layer: We determine the average response time of a message obtained with three dzfferent scheduling algorithms. This evaluation takes into account message segmentation in the Bluetooth MAC layer: Thejrst scheduling is the Bluetooth native scheduling called One-Roud Robin (I-RR). The second is a variant of I-RR where the local scheduling is based on the two QoS parameters considered. The last one, called Class-Based Earliest Deadline First (CB-EDF), takes into account the two QoSparameters both at the local level and at the global level.