One of the challenging developments to affect supply chain management in recent year is the advent of Electronic business-to-business commerce. New information technology offers new opportunities to improve effectiveness and efficiency of supply chain management. Interorganizational information systems (IOS) change the ways in which firms do business and provide the foundation for timely information sharing among trading partners. IOS has the potential to significantly alter the basis of competition in the marketplace and provides new opportunity to allow trading partners to get expanded benefits. During the process of IOS design, implementation and usage, power imbalance is an unavoidable phenomenon, which determines the competitive position within and outside the IOS supply chain network.; This study focuses on the following questions: What determines the apportionment of the expanded benefits brought by the participation of IOS supply chain network? What is the role of power in the relationships during the division process of expanded benefits in IOS context? What are the determinants of power in IOS supply chain network? What are the relational outcomes and economic outcomes of power in IOS supply chain network context?; This research represents one of the first large-scale empirical efforts to explore the power in IOS supply chain network context. Based on a comprehensive literature review, a research model was developed to explore the determinants (i.e. learning capability, supportive leadership and IT support capability) of the power from behavioral and technical perspectives and examine the economic and relational outcomes of power (i.e., value appropriation and relational quality).; Valid and reliable measures of the constructs were developed. A large-scale survey yielded 228 usable responses from purchasing professionals. Rigorous statistical methods were used to assess and validate the constructs. The research findings supported almost all of the proposed hypotheses. This research has important implications for academicians and practitioners.
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