This paper was conducted to analyze the effects of end-user support tasks, as perceived by MIS personnel, on role variables and job performance variables. Role conflict was measured as the role variable, and job satisfaction and organizational commitment were measured as job performance variables. An empirical analysis was conducted based on questionnaires from 210 MIS personnel working in the computer departments of Korean firms, and the research results are summarized as follows. First, MIS personnel strongly perceive the need for user support. In particular, MIS personnel feel a heavy burden during the early stages when end-user computing begins to proliferate. Second, an increase in the perceived need for user support increases role conflict but has no direct relationship with job satisfaction or organizational commitment. Third, role conflict functions to reduce job satisfaction and organizational commitment, which is consistent with the findings of prior studies in the behavioral science field. In summary, the support task burden induced during the early proliferation stage of end-user computing negatively affects the role conflict of MIS personnel and serves as an indirect cause of decreased job satisfaction and organizational commitment. Therefore, to prevent the decline in motivation among MIS personnel during the proliferation process of end-user computing, it is essential to reduce their support task burden.