Currently, much efforts have being focused on dynamic, personalized QoS-based service selection, however, current QoS models are generally composed of static QoS parameters and haven?t taken the dynamic nature of service performance into consideration. In our framework, we extend existing QoS model by adding new attributes that reflect performance of services and rely on ANN to provide client dynamic, on demand service performance prediction. Through this way, a client may be more capable of finding the best service based both on his/her preferences and on the service performance estimation.