Order communication system(OCS) could change involved users' work pattern profoundly. Also adaptation to OCS and satisfaction with it influence the efficiency of management in hospital. This study applied self-administered questionnaire and individual interview to evaluate changes of users' work pattern, adaptation and satisfaction after the introduction of OCS. The survey measured the experience of computer use, user's evaluation on OCS education, degree of usage, change of work patterns, relation with co-workers or other departments, user's adaptation and satisfaction of physicians, nurses and pharmacists who worked in two university hospitals in Seoul that had introduced OCS. The major findings of this study were as follows; 1. Changes of users' work patterns were different between two hospitals. In a hospital major business time to issue and confirm order was decreased but in another hospital increased . 2. Relations of doctors with nurses were also different between two hospital. Frequency of contacts in a hospital was increased and doctor-nurse relationship grew worse, while in another hospital decreased and grew better. These situations were observed on the relationship with other departments, such as pharmacy and admission/discharge service. 3. There were no significant variables that explained user's adaptation, but again there was a difference between hospitals. 4. User's satisfaction was significantly affected by hospital and job catergories classified. Level of satisfaction of a hospital was higher than that of another, and highest in pharmacists, and the next was nurses and doctors in order. 5. There was o difference in satisfaction level by the type of hardwares, operations and accuracy between hospitals, but was difference by the contents of information, convenience of use and timeliness between hospital. The hospital factor consistently influenced users' work pattern, adaptation, and satisfaction. It implied that, if OCS was designed familiarly and conveniently for users, users' resistance will not trouble the implementation of OCS.