A safe and well documented decision making is necessary to achieve the best economic and environmental performance for Swedish agriculture and farmers. In this work, experiments, research and development have an important function and the regional field trials is a very important part in this process. The objectives for the regional trials is to utilize and coordinate national and regional needs for crop development. At the same time, it is of most importance that coordination between regions are made to use resources effective. The experimental activities will be strongly supported by both industry, farmers, advisors and researchers. Field trials must have such a scientific performance that it is possible to get answers to the questions and that a statistical analysis of the results can be implemented. Work will also include regional differences.