Abstract
Most of the descriptions and definitions of systems are based on flow charts or block diagrams. Such representation generates difficulties related to the structure complexity. The basic obstacle arises from the fact of the arbitrary representation of elements with complex relationships. Each system can be, however, described by the graphical representation provided through diagraphs (so-called topological description). From the point of view of failure propagation, analyses based on undirected graphs are not useful. On the other hand, such notation allows for simplification of the definition and analysis of relationships of the subsystems. A more useful representation is formalized notation in the field of directed graphs, because it allows to determine the direction of propagation of failures between the subsystems and identification of structural dependencies (in the case of functional structures). In such case the author used the FMECA methodology assumes the participation of professionals, whose main task is to provide the assessment of the failure impact on system operation.
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