V.G. Dovbnya, S.I. Sheldeshov
The method of formation of descriptions of situations in information-analytical systems (IAS) is offered. The method is based on laws of the structurally-heuristic concept of processing of the information and cognitive psychology. The presented method allows to realise construction of hierarchical system perceptive and reflex models of an initial situation of various degree of aggregation during the decision of problems IAS.