In 2016, EMSA initiated the first FIRESAFE study in order to investigate cost-efficient measures for reducing the risk from fires on ro-ro spaces with a focus on Electrical Fire as ignition source as well as Fire Extinguishing Failure. In 2017, EMSA initiated the FIRESAFE II study to investigate risk control options in relation to Detection and Decision as well as Containment and Evacuation, following a ro-ro space fire incident on any ro-ro passenger ship.The main objective of FIRESAFE and FIRESAFE II was to improve the fire safety of ro-ro passenger ships by cost-efficient safety measures reducing the risk of ro-ro space fire, with an aim to discuss specific proposals for rule making.This report presents the results of the combined assessment of cost effectiveness based on the results from the different parts previously considered separately in FIRESAFE and FIRESAFE II.The combined cost-effectiveness assessment was performed on 21 Risk Control Options (RCOs) for three generic ships representing the world fleet of RoPax ships (Cargo, Standard and Ferry RoPax), taking into account potential differences between Newbuildings and Existing ships.Recommendations for decision making were provided based on the results of the combined cost-effectiveness assessment.