The aim of this paper is to explore the role played by cost accounting in Italy’s Industrial Mobilization system and in the largest firm manufacturing weaponry, Ansaldo of Genoa, during WWI. While in other countries such as the UK and the USA, efficiency in buying and managing war material was an important part of military strategy, in Italy, various factors impeded it. This paper focuses on contracting procedures adopted by the Ministry of War and Ministry of Munitions and looks at the cost accounting practices in Ansaldo to see how costs were determined and how prices were set. We found a paradox. On the one hand, despite knowledge of costing, the government did not impose cost controls on the producers of war material, nor on their profi...