The project Beräkningsmodeller och underlag för verkans- och sårbarhetsvärdering is part of the Armed Forces research program. The aim of the project is to develop models and implement them for use in vulnerability- or lethality (V/L) analyses on a platform level. A specific purpose of the project is to make use of the existing knowledge at FOI on specific phenomena related to the interaction between warheads and protected platforms by implementing them into V/L analysis. The main topics studied in the project during 2021 are: ? Behind armour debris model ? Model of initiation of warheads by impact ? Human vulnerability ? Penetration models for fragments at high velocities ? Modelling pressure and simulation of structural damages in ships ? Munition and protection performance database