Digital Sound Recorder: A case study on designing embedded systems using the UML notation. Ivan Porres Paltor Åbo Akademi University, Department of Computer Science, Lemminkäisenkatu 14, FIN-20520 Turku, Finland email: Ivan.Porres@abo.fi Johan Lilius Åbo Akademi University, Department of Computer Science, Lemminkäisenkatu 14, FIN-20520 Turku, Finland email: Johan.Lilius@abo.fi Turku Centre for Computer Science TUCS Technical Report No 234 January 1999 ISBN 952-12-0367-6 ISSN 1239-1891