Expert systems have a number of attractive features that make them good candidates for the development of maintenance diagnostic aids. However the style of user-expert system interaction that is conventionally employed tends to be rigid, making the systems prone to many of the same pitfalls that other forms of job performance aids have been subject to. We review some of the limitations of the conventional style of user-expert system interaction, and describe a prototype expert system for electronics troubleshooting that allows users more control over the interaction.
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