Description: During organization of air defense a ponder able value acquires realization of interaction which is definitely a managed process purposeful activity of corresponding commanders for concerted and interrelated for the purpose, by a task, at times, place, and by the methods of implementation of tasks of actions of subdivisions. The primary purpose of interaction is creation of the most favorable conditions for realization of battle possibilities every subdivision that takes part in an air defensive. It is expedient to examine coopera-tion as system that must be appraised through the indexes of efficiency of air defense. It is always possible to name some organizational, operative and technical events, character of those or other connections of interaction what in largely pulls to the change of efficiency of air defense in an operation changes at implementation of that. One of important properties of processes of interaction there is their controllability. For an interaction management, as a rule, use un basic communication of existent control channels of system and can be formed the temporal organs of management. And such properties of control system, as quality, firmness and operativeness, in consider-able, predetermine efficiency of cooperation. That is, the indicators of the effectiveness of the organization of interaction should be critical to the management system's properties. At optimal organization of interaction battle possibilities of interaction forces and facili-ties can be realized maximally maybe, while in case of their independent actions - not in a complete measure, and will be determined by internal properties of their control system. During the estimation of efficiency of interaction we must measure the degree of benefit, utility of intercommunications of interaction elements of the system of cooperation, id est efficiency of one interactive elements of the system of cooperation on other element what measured through the change of efficiency last. So, indexes that are used for description each of types of influence must represent not only a positive result (result organized to cooperation) but also are possible negative con-sequences are non-organized to interaction.
Keywords: air defense system, organization of interaction, efficiency of interaction, assessment of efficiency.