This paper presents a Service-Oriented Coordinated Intelligent Rational Agent (SO-CIR-Agent) model to address three design issues of open Cooperative Distributed Systems (CDS): autonomy, distribution, and heterogeneity. This work incorporates the service-oriented design paradigm, agent-oriented design paradigm, and Web service technology as supporting pillars by extending the CIR-agent model so that agents can survive not only in agent-oriented environments but also in service-oriented environments. The implementation issues of the proposed agent model are discussed at the end.