Therefore, seven more factors for evaluating Information System successfulness have been added to the 39 factors defined by Bailey and Pearson. These seven factors are: user’s attitude toward usage of CBIS (follows into group of “conflict resolution”), clarity of output, transparency of output (goes into group of “information quality”), productivity of tools supporting organizational structures (follows into group of “user satisfaction”), improvement of productivity thanks to CBIS, efficiency and effective ness of system (these factors go under the group “organizational influences”). The number of factors for measuring successful ness of information system has increased to 46, which cover all eight categories.