This document describes the activities within the project Weapon System Assessment (Vapensystemvärdering) for the year 2013. The activities have been divided into five areas that are important for supporting the Swedish Armed Forces with competence to assess weapon systems. These areas are covering research trends, assessments, methodology for weapon system assessment, development of models and tools, and quality assurance. During 2013, already started activities with development of models and tools for assessing spin and fin stabilized projectiles have been finalized, and improving the ability to assess ground based air defence initiated.