This report aims to study the possibility of FOI supporting the Swedish Armed Forces in terms of simulation based weapon system assessment for ground combat. The focus lies on combat performance assessment of weapon systems. The eort is directed at analyzing how to combine simulation results to perform assessments at a tactical level. The long term goal of this project is to be able to contribute to answer questions like How will ground combat be conducted in the future? and to be able to assess the combat eectiveness of weapon systems during implementation of new and modernized systems. The Swedish Army organized to be able to conduct combat warfare against a well-trained and well-equipped opponent. This requires an operational antitank capability (direct re, indirect ne, mine warfare) and the combination of these weapon systems.. To help address this, several questions of interest on war ghting levels are identied in this report, these are deemed suitable for solving by means of simulation based weapon system assessment of antitank weapons. Models of dierent weapon systems should be constructed and thereafter combined to measure the combat eectiveness. The vision with this work is to have a model library of the complete anti-tank weapon portfolio, but as a rst step it is recommended to implement models for a main battle tank/infantry ghting vehicle, followed by models for anti-tank guided missiles and mines. Scenarios used for assessment and validation can initially be taken from the typical combat tasks for a squad, platoon or company. To ensure the relevance in the assessment process, combat eectiveness in terms of weapon system performance should be dened and formalized for each scenario.