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This study explicates and tests three network-based mechanisms whereby individuals' attitudes toward an integrated health information system may be influenced by the attitudes of proximate sources of social information. Estimates of the attitudes of generalized others are not convincingly associated with the actual attitudes of specified others. Overall, specific others' actual attitudes have only a small effect on one's attitude. Social information operates positively through communication and work-unit mechanisms (especially when weighted by importance), and negatively through the mean attitude of one's structurally equivalent position, but not through overall organizational proximity or spatial proximity. Differences in attitudes among occupational groups may have been due to implementation policies.