Sustainability in architecture is the central theme of this DAM annual. This subject is treated in all its technological, sociological and aesthetic aspects with essays discussing not only innovations in ecological construction but also the question of economic and political attitudes to environmentally conscious architecture. Sustainability was also the guiding principle in the selection of buildings under examination in the annual. The concept of "sustainability" has established itself as a watchword for ecologically responsive building, planning and economics. The increasing interest in sustainable forms has been accompanied by a search for enduring aesthetic qualities. Traditional building forms and methods of craftsmanship as well as completely innovative materials and methods have thus gained in importance.