This workshop will continue the initiative, which started four years ago, of bringing together the international communities of dependability and software architectures. The first workshop on Architecting Dependable Systems was organised during the International Conference on Software Engineering 2002 (ICSE), and since then five workshops were organised and three books were published (http://www.cs.kent.ac.uk/wads). This activity has culminated in 2004 with the organisation of the Twin Workshops that were held at ICSE 2004 and DSN 2004. This series of workshops have shown to be a fertile ground for both communities for clarifying approaches that have been previously tried and succeeded, as well as those that have been tried but have not yet shown to be successful. This not only helps avoid the reinvention of the wheel, but also clarifies and promotes areas where the most promising research may lie.