Are considered problems and contradictions, reducing reliability of the dynamic information systems. The dynamic are adopt the systems the subject domain of that suffers changes on the stage of exploitation. The features of the dynamic information systems, distinguishing them from other types of the systems and the contradictions related to them, are educed. Is shown, that the necessity of making alteration on the stage of exploitation results in the decline of reliability.
dynamic informative systems, reliability, subject domain, structural synthesis, changes a subject domain