The uses of monitoring are extremely diverse. Numerous monitoring systems have some common characteristics, which makes it possible to talk about monitoring as an integral independent scientific and practical phenomenon, which is interdisciplinary in nature. Monitoring problems in all areas of its use are being solved simultaneously: at the level of their theoretical understanding and at the level of its practical implementation. The existence of a large number of different monitoring systems gives rise to the need for their certain ordering. We have attempted to classify existing monitoring systems on several grounds.
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