Remediation of contaminated sites is one of the largest expenditures of the Swedish Ministry of the Environment. In addition, the remediation field is characterised by a relatively low, albeit growing, degree of innovation. There is a great need for research that is useful to the problem owners, the authorities and those carrying out investigations and remediation work. We need a greater degree of collaboration between different disciplines, including technology, law, finance and the natural sciences. Researchers, problem owners, contractors and authorities have a joint responsibility for carrying out transdisciplinary research and development, and this is where we believe FRIST has an important role to play, in extending our knowledge of contaminated sites!