Factors that have nonstochastic unspecified natural and objective direction of political, economic, social, ethnic or otherwise characteristics, determine the nature of behavior of the development of a complex system functioning. A person who makes a decision (PMD), promotes to purposeful development of a complex system functioning. For two different complex systems influencing of these factors directions and targeted PMD assistance for their development at some time may lead to the pre-conflict situation formation. Definition of the precise subset of impact factors with accepted level of the membership function of fuzzy core of fuzzy binary ratio of strict preference of whole set of factors that are taken into consideration, is the essence of the methodological approach of estimation the level of pre-conflict situations tension.
pre-conflict situation, tension, nonstochastic uncertainty, fuzzy subset, impact factors