Résumé: Specification and description language (SDL) is the premier language for specification, design and development of real time systems, and in particular for telecommunications software. SDL-2000 became the international standard in force in November 1999, replacing the previous version. This paper gives an overview of SDL development in ITU-T up to the end of 1999. It covers a short history of SDL including details of the updates to SDL for SDL-2000. The paper fills a gap between previously published tutorials and the current SDL standard by providing notes on the updates. Plans for the further development of SDL in the 21st Century and the role of the SDL Forum Society

Langue: Anglais