Abstract: We present a case study in requirements modeling for a medical multimedia Lecture on Demand (LoD) system. Our focus is to produce a requirements model reflecting the functional and the Quality of Service (QoS) requirements for LoD instruction on medical procedures, and to also consider requirements from other telemedicine multimedia applications in order to create a general requirements model for medical LoD systems. We discuss the medical LoD application, characterize requirements for other telemedicine applications, and represent the resulting requirements model as a UML use case model.