The Nordic countries have a long tradition for cooperation, especially in the environmental field. This cooperation has been useful for every single Nordic country, and the Nordic countries have together been influencing international environmental policy implementation. One of the areas in which the Nordic Council of Ministers has had great influence in the environmental area is in defining and describing BAT – Best Available Techniques. Building upon the Nordic tradition for prevention of pollution, the Nordic countries have had many experiences to draw upon in the international negotiations about what should be seen as BAT in a given sector. This booklet describes the work of the BAT group and their results in relation to both the national and international perspective. The work of the group has been disseminated through a range of publications, which are informative and useful for authorities, organisations and companies working with BAT.