Fiscal Impact Budgeting Systems (FIBS) are sophisticated computer based modeling procedures used in local government organizations, whose results, however, are often overlooked or ignored by decision makers. A study attempted to discover the reasons for this situation by focusing on four factors: potential usefulness, faith in computers, production process knowledge, and input data accuracy. Subjects, approximately 100 officials and members of citizens' boards, responded to 30 Likert-type scale items covering the four factors and the dependent variable: output acceptance or rejection. Results indicated that only faith in computers was nonsignificant while perceived accuracy of input data made the most important contribution to perceptions of quality of output. These results imply that organizations should pay more attention to user involvement in implementation and knowledge adequacy. Decision makers must also become more aware of how the FIBS model works. (JL)