Keeping in mind the high frequency of the applicability of models, experiments, and modal experiments in the implementation of fundamental, applicable and developmental research, the role of these methods in cognitive scientific processes is extremely important. Their application is also important in verification and heuristic research in the scientific classification, description, explanation, forecasting and detection of phenomena. The security system of any state must be prepared to adequately respond to all potential security challenges, risks and threats, whose probability of occurrence may be higher or lower. That is why the application of modal experiment in studying the security system and its response to potential sources of threats may have decisive effect on its optimum organizational and functional structuring in the future. Particularly important is adequate, economical, rational, efficient, and effective structuring of defense system in proportion to the contemporary threats. Based on the indicators of probable emergence of threat and its characteristics, some forecasts may be made, which are based on manifested tendencies or on their growth or fading out. That is why the modeling method, i.e. the modal experiment method, is the most suitable if reliable information on respective phenomenon is available, corresponding to the place and the time of its occurrence. The modal experiment method is important also because the laws of social developments are such that they confirm one basic regularity - that no changes occur at the same time. This means that this method explores tendencies in a particular area, including defense activities or defense function of a state.