However, it has been noticed that these six categories refer only to systematic aspects of Information system successfulness, while overlooking the human aspects. This oversight can be solved with factors proposed by Bailey and Pearson, which cover both of these aspects. They combine the first five dimensions suggested by DeLone and McLean, leaving out organizational influence. Additionally, they include human aspect in Information System successfulness, such as Information System quality of service and conflict resolution between the users and Information Technology professionals. Information System quality of service includes the following: improving users’ system knowledge, role and competencies of Information Technology professionals and efficiency of services. Resolution of conflict includes: competition between the users and Information Technology professionals for the organization’s resources, assignment of information resources to users, communication and relation between users and Information Technology professionals, control of Information Technology professionals, and the organizational position of the Information Technology Department.