Information System user’s satisfaction is often used for the assessment of Information System functionality performances. The relation between Information System user and Information System functionality is very complex, since the Information System user satisfaction depends on interaction between a user and Information System, which determines user’s subjective rating on increased quality of his work. Nowadays, experts are using a number of different instruments for measuring the user’s satisfaction with the Information System, among which several are particularly emphasized: (a) the relation between user and Information Technology professionals, (b) definition of demands for change in Information System, (c) current and promp Gordana Platiša, Neđo Balaban 12 Management Information Systems 2/2009 information, (d) user’s level of training for work with Information System, (e) quality of output information, (f) quality of available documentation and (g) user’s level of dependence on Information System.