Methodological footing of modelling of cooperation between customs and participants of economic activity

In this article are examined different points of view of modelling such category as «cooperation» which is applied to cooperation between customs and participants of economic activity during the process of transporting goods and vehicles through the customs border of Russian Federation. Also in this article is given formal mathematical account of meaning of category «cooperation». Formal description of the interacting systems is realized on base of the «entrance - status - exit».