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This chapter has described a prototype system based on the architecture of Chapter 3. The various agents described in Chapter 4 are implemented using the JADE platform, and a reasoning engine and knowledge base based on Prolog. Use of the Prolog language provides relatively simple conversion to and from FIPA SL, as both are based on first-order logic. The prototype demonstrates the feasibility of the architecture and shows how it may be implemented. It also reveals some of the problems involved in this implementation. For example, integrating the multi-agent system with the HMI platform written in LabVIEW™ was a particularly time-consuming task, involving the implementation of a user agent in VisualBasic R® (in order to access ActiveX R® controls) and linking this agent to the JADE platform using a TCP/IP connection. The next chapter presents an evaluation of the architecture, using both theory and the experience provided by the implementation of this prototype. It examines whether the architecture provides the required functionality, and considers its ability to be modified easily in response to changes in the substation plant or in the data acquisition system. [ABSTRACT FROM AUTHOR]