In article the question of creation of structural model of information system and the general laws of its functioning is considered. The model is determined in the form of a train of the models Fит = < F, Fxy, Fyw> which elements consistently form stages of performance of IT (F– model of formation of a set of inquiries, Fxy – model of transformation of entrance object in day off, Fyw – model of a set of output documents)
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