The IEEE European Test Symposium (ETS, previously ETW) is a well-recognized forum for presenting and discussing hot topics, trends, emerging results, and practical applications in the area of electronic-based circuit and system testing. The 2004 edition of the symposium will take place in Ajaccio, Corsica (France). Surrounded by a fantastic mountain range, Ajaccio is located on the shore of one of the most beautiful gulfs in the world. This resort city is well known for both its welcoming tradition and the mildness of its climate. ETS'04 is sponsored by the IEEE Computer Society - Test Technology Technical Council (TTTC) and organized by the LIRMM.