The LASS project– Lightweight construction applications at sea – aimed at improving the efficiency of marine transport and increasing the competitiveness of the Swedish shipping industry. The target was to accomplish this through the development and the demonstration of practical techniques for using lightweight materials for ship construction. The consortium behind the project consists of representatives from the shipping industry, material manufacturing industries, universities and research institutes as well as public authorities and classification societies. The project started in January 2005. LASS is sponsored by VINNOVA (www.vinnova.se), participating industries and other partners. This report contains a description of some of the accomplishments made.