An IOS is an information and management system that transcends organizational boundaries via electronic linkages with its trading partners. The electronic linkage is established by information and communication technologies. Extranets1 are the core technology for building IOSs. There are a host of other technologies that serve as the infrastructure for managing IOSs. They include coordination technologies, monitoring technologies, filtering and negotiating technologies (intelligent agents), and decision-making and knowledge-management technologies. In this chapter, a brief overview of each of these technologies is presented.