~ ~ This chapter discusses the technology and methodology used in designing and implementing the Concurrent Engineering Demonstration System, called SNEAKERS. The first of these is the expert system development tool called CLIPS, which was used to develop the agents, and to maintain a database of the parts of the object being built. Next is the Motif user-interface development/prototyping tool VUIT. This tool was used to put together the pieces of the user-interface into a coherent structure. A technique known as storyboarding was used to design how the screen would look at crucial points during program execution, before the user interface was built. This chapter concludes with a discussion of the knowledge acquisition which helped to determine the features that should be displayed by the system and how best they could be shown, as well as the knowledge that went into the agents.