This text takes a broad view of the work going on in the development of user interfaces for expert systems and examines the expert system building process both in academic and industrial surroundings. The development of an expert system is viewed as containing three separate, but highly interacting components: knowledge capture, programming and debugging the system, and finally placing the system before an active user community. Some of the issues in each of the three components, the application of general human factors principles in the design of expert systems, the special needs in the design of expert systems, and the efficacy of these interfaces.