摘要:Information technologies have great influence on the performance of organization. They are related with the changes in organization activities and structure of organization. A view to organization as a three-layer system where information flows connect material flows with decision makers is presented in this article. Three criteria (time, cost and path) are used in a formal model that evaluates organizations information flow effectiveness. This article pre-sents a methodic for choosing information technologies that fit organization needs by performance and cost. Petri nets are used for modeling.