Decision support systems (DSS) are increasingly important in this highly competitive environment in which organizations face frequent and complex decision problems. The increased popularity of web technology has pushed most information systems to be web-based; DSS is no exception. Model management as a major component in DSS is also moving toward this direction. Therefore, this research examines how web services technology can be used to implement model management for decision support. In this research, a model is treated as a service. The primary purpose of this research is to achieve model integration capabilities. We adopt existing techniques for web service composition to implement a system that can support model integration. In other words, we use WSDL and BPEL4WS to develop a model integration and management method to support organizational decision making. Service-oriented architecture (SOA) is a trend for future information systems. Web service technology is the foundation for this paradigm shift. The method developed in this research can facilitate an organization to better manage its decision models to increase its competitive advantages.