Concrete is at something of a crossroads: there are many opportunities and some threats. For these opportunities to change into beneficial practice, engineers, material scientists, architects, manufactureres and suppliers must focus on the changesthat are required to champion concrete and maintain its dominance within the global constructuion industry. The Concrete Technology Unit (CTU) of the University of Dundee organised this Congress to address these changes, under the theme Global Construction: Ultimate Concrete Opportunities 5-7 July 2005.