As of the 7th of March 2024, Sweden has become a member of the North Atlantic Treaty Organisation, NATO. Interoperability between the two organizations will be essential to ensure a high level of cooperation in future multinational land operations. The study will be conducted on NATO doctrine: Allied Joint Doctrine for the Conduct of Operations, and the Swedish Armed Forces army doctrine: Reglemente Armé - Taktik 2023. The aim of this study is to show the level of organizational and technical interoperability between the two doctrines through the theory of Levels of Coalition Interoperability (LCI). By comparing the two doctrines to each other we find that the Swedish army and NATO are similar in many descriptions of methods and principles, mostly since the Swedish army has chosen to adept many parts of their doctrine towards NATO. However, NATO do show a lot of flexibility and adaptability towards partner nations, giving the two doctrines a high level of interoperability. The doctrines differ in description of methods for data exchange at a physical level and gives room for commanders to interpret certain aspects of the doctrines, which shows that there can be developments made to increase the interoperability, mainly in the area of adaptation of standardized methods.