The aim of this work is to create a methodology for building a knowledge base in a fuzzy environment of information-analytical complex of dispatcher control of gas flows as an analytical expression for assessing the probability of the system going beyond the permissible limits. Currently, the main thing in decision-making is the qualification of the operational dispatch personnel, software to support decision-making so far does not exist. Making any decision is inherently a multidimensional problem, and the factor space contains "fuzzy" information. Methodology for building information-analytical complex provides as the main step - the creation of a knowledge base of decision-making in the form of an analytical expression. The equation is necessary to build a fuzzy logic regulator in the intelligent ACS of decision-making in gas flow management, and can also be used to create an "adviser to the dispatcher" and simulator.
