In marine coastal environments, sediments contaminated by anthropogenic activities are a significant source of hazardous substances. However, there is lack of harmonised assessment methodology or common management protocols for contaminated sediments among the Baltic Sea countries. Thus, there is an urgent need to develop guidelines to combine chemical and biological measurements to obtain reliable evaluations of sediment toxicity. The project aims at creating a platform for analysing state of the art in the current risk assessment of contaminated sediments in order to set the basis for the harmonisation of methodologies.