The first workshop in this series took place in Grenoble, France, 1998 and the second workshop was held in Ancona, Italy, 2000. This workshop's scope has expanded to include nonlinear systems. This workshop also contains various "new" applications of delay systems including those of communication networks and computing. The effects of delay are currently being felt in many research areas and this workshop was held in an attempt to bring together researchers from various technical fields in order to advance our understanding of delay phenomena in dynamical systems.