This is a study commissioned by the European Maritime Safety Agency, EMSA. It consists of two parts, investigating risk control options (RCOs) for mitigating the risk from fires on ro-ro decks. The first part considers RCOs in relation to Electrical Fire as ignition risk and the second part considers RCOs to mitigate the risk of Fire Extinguishing Failure (with focus on drencher systems). The study considers both newbuildings and existing passenger ships, and has been done per the instructions and limitations in the Tender Specifications (EMSA /OP/01/2016).