On behalf of the Organising Committee of the 11th ARTS I would like to welcome all the delegates, session chairpersons and authors. I particularly welcome new delegates, delegates from mainland Europe and from other countries. At the time of the last symposium, our tenth anniversary, we looked back on the growth of the symposium and the support it had received from so many people. Not least was the support given by Mrs Ruth Campbell who, between this symposium and the last, has retired from the National Centre of Systems Reliability. The Organising Committee would hereby like to acknowledge a...