Problems with analyzing operational data uncertainty

The paper deals with problem of uncertainty of information and data obtained during operation and maintenance processes of technical system. The notations of uncertainty are discussed. The classification of uncertainty mathematical models is shown based on generalized information theory by G.J. Klir. Three examples of analysis of operation data uncertainty are shown: comparison of reliability measures obtained from statistical data and expert opinions, analysis of uncertainty of expert opinions about failure reasons and possibilities of use fuzzy measures.