technology systems initiate activities and track information regarding processes, facilitate information sharing both within the firm and between partner, and assist in management decision making. This chapter describes comprehensive information systems as a combination of transaction, decision support, and communication systems. The chapter begins by describing the role of information systems functionality in suppllychain competitiveness. Then the chapter describes the major modules and external interfaces of supplyychain information systems. The remaining sections discuss enterprise integration and administration, enterprise operations, enterprise planning and monitoring, and communication technology applications respectively. The final chapter section discuss the movement to offering software as a service rather than requiring each firm to have their own copy of each application.