Models and databases for predicting doses and the effect of countermeasures taken to reduce dose following the accidental release of radioactive material into the environment are an important part of a system for assisting emergency response decisions after an accident. The module ECOAMOR comprises a dynamic radioecological model which takes into account all relevant processes leading to contamination of foodstuffs and a dose module for the calculation of internal and external doses in the absence of countermeasures. The module FRODO assesses the consequences of the long-term countermeasures; relocation, food countermeasures and decontamination. In the development of FRODO so far, emphasis has been placed on modelling the effects of countermeasures that could be applied to cows' milk based on a number of different criteria. This paper gives an overview of the main features of the ECOAMOR and FRODO modules and their associated databases for integration into the decision support system RODOS.