The processes taking place in nature reflect its self-organization and dialecticism. The infinite variety of these processes dictates the need for limiting the region of study by some frame of reference (concepts, systems, models), the bounds of which are determined by the posed task. The need for the systems approach in the analysis of certain phenomena is universally recognized. However, in practice adequate attention is quite often not devoted to the construction of the system, which leads to significant reduction of the effectiveness of the analysis. Also not rare are erroneous conclusions that may be, specifically, the consequence of violation of the limits of the applicability of the selected model of the phenomenon. In the rationally constructed model of the dynamic system there will be clearly followed the laws of dialectics (the unity and conflict of opposites, the transition from quantity to quality, and soon), since these laws determine the most general relationships of the development of any system. In accordance with the general theory of systems, the building of the model includes the identification of its parts and the clarification of the direct and indirect connections between them. Experience shows that it may be very difficult to discover these connections, particularly the indirect connections.
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