The creation of inventories occurs in logistic chains of goods flow. This results from both technological conditions and from the rationali sation requirements of organisational activities. In logistic chains within single companies, there are inventory systems of different levels. This article presents an example of a two-level system of inventory control in construction company logistics. In order to investigate and analyse this system, a simulation model was employed. The results obtained from the simula tion were used to select input parameters which radically influence the functioning of the sys tem. Selected parameters were used to build a criterion function. Total inventory costs are presented as a regression function. The analyti cal form of a cost function arrived at in this way allows the examination of tendencies in forming logistic costs in relation to controlling changes in variables. Here we propose employ ing simulators of inventory systems in decision support systems (DSS) for the logistics of a company's physical supply of products, in-process materials and raw materials.
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