The main objective of the Action was to increase the knowledge of properties and possibilities of glazing in order to increase the performance of building envelopes, to reduce energy consumption and to improve the quality of life with respect to interior space, impact on the environment and human welfare. The Action made optimal use of existing and currently developing knowledge, and aimed to function as a source of valuable information to national and international Standards organisations. The results were disseminated to the broad professional public at its Final Conference, attended by number of participants from the construction industry and design.