In order to receive truthful answers,appraisals should be conducted by an independent evaluator and the participants must stay anonymous, except for the identity of their functional areas. Knowing the functional area of every participant, information system management can easily evaluate the level of dissatisfaction within any individual functional information system and in line with that take direct action toward solution. Moreover, participants should know as little as possible in which manner information system management uses assessments of information system successfulness in order to manage their projects and resources, otherwise participants could start to manipulate the evaluation of information system successfulness in order to withdraw indirect attention of information system management to themselves. In order to avoid such events, they should determine a detail check and verification of ความไม่พอใจ factory factors of information system successfulness.