This contribution concerns the problems of information system in the broadest meaning of the word and the approaches and methods used to analyse it. This work examines how they are percepted in present days and what is their mutual relationship. It outlines the possibilities and problems of analysis, defines the relationship of information system and processes. Anyway, many analytic instruments and methods´ results give the similar output as our motto. This contribution emphasizes the importance of the holistic comprehension of the term “information system” and the importance of its general quality in relation to principles of modern management.Motto:„We are drowning in the oceans of data, missing the information we need“E.M.Goldratt