Assessments of information system successfulness should be gathered periodically from each and all functional areas in organization. In order to get final grade on information system functionality performances in organization, gathered results must be processed statistically. For the analysis of gathered data, the following statistical procedures are commonly used: arithmetic mean, standard deviation for each point, Interco relation of points, multiple regression of points, liable scale, variance analysis, factor analysis, cluster analysis of variables (Word method), components analysis, method of multidimensional scaling (squared Euclid discrepancies ), and others. Such information would provide the information system management with the opportunity to oversee the total information system quality (across the whole organization), so as to compare qualities between the different functional areas of information system and to review improvement process of functional or integral information system.