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Abstract: The paper is devoted to the presentation of a new formal description technique RT-LOTOS (Real-Time LOTOS) which is a temporal extension of the standard formal description technique LOTOS. After a brief introduction to LOTOS, the first part of the paper describes the main features of RT-LOTOS both informally by means of simple examples and formally by detailing its operational semantics and stating some important properties of the model. The second part of the paper shows the applicability of RT-LOTOS for the formal design of multimedia protocols. A design method based on generic and reusable specification building blocks is presented for formalizing an intra-stream synchronization mechanism designed and used within the CESAME project. Several simulation results obtained with RTL (RT-LOTOS Laboratory), the tool environment supporting RT-LOTOS, are presented for assessing the quality of service of the proposed mechanism. Key words : Formal methods, LOTOS, Multimedia synchronization RT-...