The spread of chemical components in the marine environment is simulated using the model FATES (a component of the SINTEF Marine Environmental Modeling Workbench). Individual to population level effects are quantified using OMEGA (Optimal Modeling for EcotoxicoloGical Application) or DEB (Dynamic Energy Budget). OMEGA requires generic, readily available toxicity data and physicochemical information while DEB requires data from toxicity experiments carried out for the species and compounds under consideration. Data assimilation and analysis is a key activity of this program component.