CMMS is about conceptual descriptions and models of military operations. It is the first level of abstraction when describing reality and aims to address characteristic details of the problem space. The concept of CMMS consists not only of conceptual models but also of tools for their development and reusability, a common library to store them, and standards for acquisition and integration of knowledge. Conceptual models are supposed to act as a bridge in the communication between modellers, system engineers, domain specialist and end users. The foremost reason for using conceptual modelling is to catch misunderstandings early in the development processes. The project´s work during 2003 has focused on the concept of knowledge acquisition and knowledge engineering i.e. the KA/KE process. In conjunction to this, issues related to the problem domains; language and tools have been addressed. These three domains have a natural connection to each other in the way that they all are needed in order to map the early phases of the CMMS development process. The part of KA is discussed thoroughly together with some methodologies for knowledge acquisition. The KE part describes guidelines on knowledge engineering in a similar manner while the language and tools chapters are only briefly discussed.