Today, the word Concept is one of most used terms in the framework of long and medium term of defence management. Concept development as a process is mentioned in significant number of departmental regulations and descriptions of activities of organizational bodies of the Ministry of Defence and General Staff. Concept development and Experimentation is a kind of incantation used when we speak about the development of long and medium term strategic documents. This article comprises the analysis of the legal regulations concerning the development of strategic documents. It analyses the implications of the governmental Methodology of mid-term concepts and Methodology of preparation of public strategies for departmental strategic documents.