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There are many business information systems under operation supporting the essential business processes of large scale multi-national enterprises, which forms the essential IT assets of these organizations. However, the isolation of these systems, improper process configurations and unbalanced resource allocations often leads to the deterioration of these enterprises, or even major management crisis. Service-oriented computing is considered a possible remedy for such issues with relatively low migration cost that has attracted much industrial attention. In this paper, through a survey to an industrial consulting case from a Southeastern Asia Garment Manufacture, we discuss how service requirements are elicited, how to evolve conventional management information systems into composite service systems that is reconfigurable at runtime, so as to realize resources optimization and efficiency improvement. The purpose of this paper is to analyze the know how of migrating conventional management information systems into service-oriented architecture, from a requirements engineering perspective.