The estimation of information volume in a system with non-stationary incoming stream

The problem of information lifecycle management is now one of the basic problems of the development of information technologies and societies. Uncontrollable growth of information volumes and the essential physiological restrictions on its processing (perception, judgment) can lead to the information collapse. In a stationary case the model, allowing to estimate and predict the volumes of information subject to storage and processing, is based on Little's formula. This paper offers a model applicable for the non-stationary entrance stream and the fixed function of distribution (density of probability) to time of the information staying in a system.