The number of political goals set, and decisions taken, in respect of environmental matters at both the international and the Swedish national, regional and municipal levels is constantly increasing. The overall goal in the Swedish context is to become a sustainable society. The municipalities are expected to hold a key role in this transition, specifically through their spatial planning and their responsibilities for environmental and health issues. The aim of this thesis is to increase our empirical understanding of the day-to-day planning practice and environmental work. One important assumption here is that changing conditions, for example in relation to changes in legislation or bureaucratic re-organisations, do not always have an impact on every-day professional practice. In focus are therefore the day-to-day work and the professional perspectives as the professionals themselves articulate them. Interaction between occupational groups, the role of occupational culture and perspective and the articulation of knowledge is highlighted. The methods used for empirical data gathering are qualitative interviews and focus group sessions. The theories applied concern mainly professions, organisational culture and planning theory. It is apparent in the studies that the professional groups often have simplified, stereotypical images of one another, even though each group without exception has respect for the other professional groups. However, there are difficulties in the translation between officials of knowledge and evaluation of facts of the different groups. There is often low understanding of the fact that other groups act based on their professional knowledge and experience. The thesis show that national regulations and legislation alone cannot guarantee that environmental management will be prioritised at the local level – a gap between national policy and local practice here is clearly demonstrated. It should however be noted that the level of environmental competence in the local public administration is adequate and increasing. / QC 20100617